521656396 has 12 divisors (see below), whose sum is σ = 914571448. Its totient is φ = 260350272.

The previous prime is 521656363. The next prime is 521656403. The reversal of 521656396 is 693656125.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117021 + ... + 121396.

Almost surely, 2^521656396 is an apocalyptic number.

It is an amenable number.

521656396 is a deficient number, since it is larger than the sum of its proper divisors (392915052).

521656396 is a wasteful number, since it uses less digits than its factorization.

521656396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238968 (or 238966 counting only the distinct ones).

The product of its digits is 291600, while the sum is 43.

The square root of 521656396 is about 22839.7985104948. The cubic root of 521656396 is about 804.9980818596.

The spelling of 521656396 in words is "five hundred twenty-one million, six hundred fifty-six thousand, three hundred ninety-six".