521494736 has 20 divisors (see below), whose sum is σ = 1154738592. Its totient is φ = 223497696.

The previous prime is 521494723. The next prime is 521494763. The reversal of 521494736 is 637494125.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 521494693 and 521494702.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2327990 + ... + 2328213.

Almost surely, 2^521494736 is an apocalyptic number.

521494736 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

521494736 is an abundant number, since it is smaller than the sum of its proper divisors (633243856).

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

521494736 is a wasteful number, since it uses less digits than its factorization.

521494736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4656218 (or 4656212 counting only the distinct ones).

The product of its digits is 181440, while the sum is 41.

The square root of 521494736 is about 22836.2592383254. The cubic root of 521494736 is about 804.9149176438.

The spelling of 521494736 in words is "five hundred twenty-one million, four hundred ninety-four thousand, seven hundred thirty-six".