| Base | Representation |
|---|---|
| bin | 111000101010010… |
| … | …0011000111100000 |
| 3 | 11220111110120202000 |
| 4 | 1301110203013200 |
| 5 | 12343202242003 |
| 6 | 512353324000 |
| 7 | 65054015334 |
| oct | 16124430740 |
| 9 | 4814416660 |
| 10 | 1901212128 |
| 11 | 8962038a2 |
| 12 | 450866600 |
| 13 | 243b694ba |
| 14 | 1407017c4 |
| 15 | b1d9c1a3 |
| hex | 715231e0 |
1901212128 has 96 divisors (see below), whose sum is σ = 5553424800. Its totient is φ = 632798208.
The previous prime is 1901212121. The next prime is 1901212129. The reversal of 1901212128 is 8212121091.
It is a tau number, because it is divible by the number of its divisors (96).
It is a super-2 number, since 2×19012121282 = 7229215111308576768, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (27).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1901212121) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 822238 + ... + 824546.
It is an arithmetic number, because the mean of its divisors is an integer number (57848175).
Almost surely, 21901212128 is an apocalyptic number.
1901212128 is a gapful number since it is divisible by the number (18) 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 1901212128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2776712400).
1901212128 is an abundant number, since it is smaller than the sum of its proper divisors (3652212672).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1901212128 is a wasteful number, since it uses less digits than its factorization.
1901212128 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 3281 (or 3267 counting only the distinct ones).
The product of its (nonzero) digits is 576, while the sum is 27.
The square root of 1901212128 is about 43602.8912802809. The cubic root of 1901212128 is about 1238.8256589172.
The spelling of 1901212128 in words is "one billion, nine hundred one million, two hundred twelve thousand, one hundred twenty-eight".
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