396646331 has 4 divisors (see below), whose sum is σ = 397789752. Its totient is φ = 395502912.

The previous prime is 396646297. The next prime is 396646357. The reversal of 396646331 is 133646693.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133646693 = 139 ⋅961487.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-396646331 is a prime.

It is a super-2 number, since 2×396646331² = 314656623791523122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (396646361) 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, 571190 + ... + 571883.

It is an arithmetic number, because the mean of its divisors is an integer number (99447438).

Almost surely, 2^396646331 is an apocalyptic number.

396646331 is a deficient number, since it is larger than the sum of its proper divisors (1143421).

396646331 is a wasteful number, since it uses less digits than its factorization.

396646331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143420.

The product of its digits is 209952, while the sum is 41.

The square root of 396646331 is about 19915.9817985456. The cubic root of 396646331 is about 734.7413475869.

The spelling of 396646331 in words is "three hundred ninety-six million, six hundred forty-six thousand, three hundred thirty-one".