389515840 has 56 divisors (see below), whose sum is σ = 1060045632. Its totient is φ = 133547520.

The previous prime is 389515811. The next prime is 389515843. The reversal of 389515840 is 48515983.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×389515840² = 303445179221811200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (389515843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84706 + ... + 89185.

Almost surely, 2^389515840 is an apocalyptic number.

It is an amenable number.

389515840 is an abundant number, since it is smaller than the sum of its proper divisors (670529792).

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

389515840 is a wasteful number, since it uses less digits than its factorization.

389515840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173915 (or 173905 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 43.

The square root of 389515840 is about 19736.1556540275. The cubic root of 389515840 is about 730.3118952458.

The spelling of 389515840 in words is "three hundred eighty-nine million, five hundred fifteen thousand, eight hundred forty".