390988989 has 12 divisors (see below), whose sum is σ = 565236672. Its totient is φ = 260440200.

The previous prime is 390988979. The next prime is 390988999. The reversal of 390988989 is 989889093.

390988989 is a `hidden beast` number, since 390 + 98 + 89 + 89 = 666.

It is an interprime number because it is at equal distance from previous prime (390988979) and next prime (390988999).

It is not a de Polignac number, because 390988989 - 2²⁷ = 256771261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390988979) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6567 + ... + 28724.

It is an arithmetic number, because the mean of its divisors is an integer number (47103056).

Almost surely, 2^390988989 is an apocalyptic number.

It is an amenable number.

390988989 is a deficient number, since it is larger than the sum of its proper divisors (174247683).

390988989 is a wasteful number, since it uses less digits than its factorization.

390988989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36528 (or 36525 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 63.

The square root of 390988989 is about 19773.4415062224. The cubic root of 390988989 is about 731.2314169286.

The spelling of 390988989 in words is "three hundred ninety million, nine hundred eighty-eight thousand, nine hundred eighty-nine".