390807681 has 16 divisors (see below), whose sum is σ = 578085120. Its totient is φ = 232837520.

The previous prime is 390807671. The next prime is 390807691. The reversal of 390807681 is 186708093.

It is an interprime number because it is at equal distance from previous prime (390807671) and next prime (390807691).

It is a cyclic number.

It is not a de Polignac number, because 390807681 - 2⁵ = 390807649 is a prime.

It is a super-2 number, since 2×390807681² = 305461287057195522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (390807631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98415 + ... + 102308.

It is an arithmetic number, because the mean of its divisors is an integer number (36130320).

Almost surely, 2^390807681 is an apocalyptic number.

It is an amenable number.

390807681 is a deficient number, since it is larger than the sum of its proper divisors (187277439).

390807681 is a wasteful number, since it uses less digits than its factorization.

390807681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200796.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 390807681 is about 19768.8563402135. The cubic root of 390807681 is about 731.1183714570.

The spelling of 390807681 in words is "three hundred ninety million, eight hundred seven thousand, six hundred eighty-one".