389921880 has 64 divisors (see below), whose sum is σ = 1184601600. Its totient is φ = 102660480.

The previous prime is 389921879. The next prime is 389921899. The reversal of 389921880 is 88129983.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 11086 + ... + 30045.

It is an arithmetic number, because the mean of its divisors is an integer number (18509400).

Almost surely, 2^389921880 is an apocalyptic number.

389921880 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

389921880 is an abundant number, since it is smaller than the sum of its proper divisors (794679720).

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

389921880 is a wasteful number, since it uses less digits than its factorization.

389921880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41224 (or 41220 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 48.

The square root of 389921880 is about 19746.4396790915. The cubic root of 389921880 is about 730.5655715901.

The spelling of 389921880 in words is "three hundred eighty-nine million, nine hundred twenty-one thousand, eight hundred eighty".