396569521 has 4 divisors (see below), whose sum is σ = 405792112. Its totient is φ = 387346932.

The previous prime is 396569513. The next prime is 396569527. The reversal of 396569521 is 125965693.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 396569521 - 2³ = 396569513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (396569527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4611231 + ... + 4611316.

It is an arithmetic number, because the mean of its divisors is an integer number (101448028).

Almost surely, 2^396569521 is an apocalyptic number.

It is an amenable number.

396569521 is a deficient number, since it is larger than the sum of its proper divisors (9222591).

396569521 is an equidigital number, since it uses as much as digits as its factorization.

396569521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9222590.

The product of its digits is 437400, while the sum is 46.

The square root of 396569521 is about 19914.0533543525. The cubic root of 396569521 is about 734.6939173182.

The spelling of 396569521 in words is "three hundred ninety-six million, five hundred sixty-nine thousand, five hundred twenty-one".