390955920 has 40 divisors (see below), whose sum is σ = 1211964096. Its totient is φ = 104254848.

The previous prime is 390955897. The next prime is 390955927. The reversal of 390955920 is 29559093.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×390955920³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (390955927) 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, 814252 + ... + 814731.

Almost surely, 2^390955920 is an apocalyptic number.

390955920 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

390955920 is an abundant number, since it is smaller than the sum of its proper divisors (821008176).

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

390955920 is a wasteful number, since it uses less digits than its factorization.

390955920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1628999 (or 1628993 counting only the distinct ones).

The product of its (nonzero) digits is 109350, while the sum is 42.

The square root of 390955920 is about 19772.6052911598. The cubic root of 390955920 is about 731.2108010254.

The spelling of 390955920 in words is "three hundred ninety million, nine hundred fifty-five thousand, nine hundred twenty".