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491940540 = 223457134771
BaseRepresentation
bin11101010100100…
…110101010111100
31021021200011120000
4131110212222330
52001414044130
6120451554300
715122265660
oct3524465274
91237604500
10491940540
11232762233
121188bb990
137abc28a0
14494988a0
152d2c5260
hex1d526abc

491940540 has 480 divisors, whose sum is σ = 1967099904. Its totient is φ = 100154880.

The previous prime is 491940529. The next prime is 491940569. The reversal of 491940540 is 45049194.

It is a happy number.

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 = 491940495 and 491940504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 6928705 + ... + 6928775.

Almost surely, 2491940540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491940540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (983549952).

491940540 is an abundant number, since it is smaller than the sum of its proper divisors (1475159364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491940540 is a wasteful number, since it uses less digits than its factorization.

491940540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 491940540 is about 22179.7326404085. The cubic root of 491940540 is about 789.4128735898.

The spelling of 491940540 in words is "four hundred ninety-one million, nine hundred forty thousand, five hundred forty".