393402681 has 12 divisors (see below), whose sum is σ = 649426752. Its totient is φ = 224801496.

The previous prime is 393402677. The next prime is 393402697. The reversal of 393402681 is 186204393.

393402681 is a `hidden beast` number, since 393 + 4 + 0 + 268 + 1 = 666.

It is not a de Polignac number, because 393402681 - 2² = 393402677 is a prime.

It is a super-2 number, since 2×393402681² = 309531338835975522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (393402601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3122181 + ... + 3122306.

It is an arithmetic number, because the mean of its divisors is an integer number (54118896).

Almost surely, 2^393402681 is an apocalyptic number.

It is an amenable number.

393402681 is a deficient number, since it is larger than the sum of its proper divisors (256024071).

393402681 is a wasteful number, since it uses less digits than its factorization.

393402681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6244500 (or 6244497 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 393402681 is about 19834.3812860397. The cubic root of 393402681 is about 732.7330346084.

The spelling of 393402681 in words is "three hundred ninety-three million, four hundred two thousand, six hundred eighty-one".