389779640 has 32 divisors (see below), whose sum is σ = 885060000. Its totient is φ = 154479744.

The previous prime is 389779639. The next prime is 389779651. The reversal of 389779640 is 46977983.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40340 + ... + 49059.

It is an arithmetic number, because the mean of its divisors is an integer number (27658125).

Almost surely, 2^389779640 is an apocalyptic number.

It is an amenable number.

389779640 is an abundant number, since it is smaller than the sum of its proper divisors (495280360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

389779640 is a wasteful number, since it uses less digits than its factorization.

389779640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89519 (or 89515 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 53.

The square root of 389779640 is about 19742.8376886404. The cubic root of 389779640 is about 730.4767261994.

The spelling of 389779640 in words is "three hundred eighty-nine million, seven hundred seventy-nine thousand, six hundred forty".