389640681 has 12 divisors (see below), whose sum is σ = 563850352. Its totient is φ = 259282296.

The previous prime is 389640653. The next prime is 389640689. The reversal of 389640681 is 186046983.

It is not a de Polignac number, because 389640681 - 2⁶ = 389640617 is a prime.

It is a super-2 number, since 2×389640681² = 303639720580287522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (389640689) 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, 34651 + ... + 44496.

Almost surely, 2^389640681 is an apocalyptic number.

It is an amenable number.

389640681 is a deficient number, since it is larger than the sum of its proper divisors (174209671).

389640681 is a wasteful number, since it uses less digits than its factorization.

389640681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79700 (or 79697 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 389640681 is about 19739.3181493181. The cubic root of 389640681 is about 730.3899092992.

The spelling of 389640681 in words is "three hundred eighty-nine million, six hundred forty thousand, six hundred eighty-one".