| Base | Representation |
|---|---|
| bin | 101110100011001… |
| … | …0000111111010100 |
| 3 | 11000212000221022000 |
| 4 | 1131012100333110 |
| 5 | 11144323023130 |
| 6 | 414553235300 |
| 7 | 53464062642 |
| oct | 13506207724 |
| 9 | 4025027260 |
| 10 | 1561923540 |
| 11 | 731735301 |
| 12 | 377102b30 |
| 13 | 1bb793918 |
| 14 | 10b622192 |
| 15 | 921cc260 |
| hex | 5d190fd4 |
1561923540 has 96 divisors (see below), whose sum is σ = 4894512000. Its totient is φ = 413496576.
The previous prime is 1561923509. The next prime is 1561923541. The reversal of 1561923540 is 453291651.
1561923540 is a `hidden beast` number, since 1 + 5 + 619 + 2 + 35 + 4 + 0 = 666.
It is a super-2 number, since 2×15619235402 = 4879210289612263200, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (36).
It is a junction number, because it is equal to n+sod(n) for n = 1561923495 and 1561923504.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1561923541) by changing a digit.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64656 + ... + 85464.
It is an arithmetic number, because the mean of its divisors is an integer number (50984500).
Almost surely, 21561923540 is an apocalyptic number.
1561923540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 1561923540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2447256000).
1561923540 is an abundant number, since it is smaller than the sum of its proper divisors (3332588460).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1561923540 is a wasteful number, since it uses less digits than its factorization.
1561923540 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 20966 (or 20958 counting only the distinct ones).
The product of its (nonzero) digits is 32400, while the sum is 36.
The square root of 1561923540 is about 39521.1783731204. The cubic root of 1561923540 is about 1160.2544873676.
The spelling of 1561923540 in words is "one billion, five hundred sixty-one million, nine hundred twenty-three thousand, five hundred forty".
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