390417978 has 32 divisors (see below), whose sum is σ = 796138560. Its totient is φ = 127607040.

The previous prime is 390417961. The next prime is 390417983. The reversal of 390417978 is 879714093.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89938 + ... + 94178.

It is an arithmetic number, because the mean of its divisors is an integer number (24879330).

Almost surely, 2^390417978 is an apocalyptic number.

390417978 is an abundant number, since it is smaller than the sum of its proper divisors (405720582).

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

390417978 is a wasteful number, since it uses less digits than its factorization.

390417978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4542.

The product of its (nonzero) digits is 381024, while the sum is 48.

The square root of 390417978 is about 19758.9973935926. The cubic root of 390417978 is about 730.8752733864.

The spelling of 390417978 in words is "three hundred ninety million, four hundred seventeen thousand, nine hundred seventy-eight".