390978430 has 32 divisors (see below), whose sum is σ = 721695744. Its totient is φ = 152433696.

The previous prime is 390978391. The next prime is 390978431. The reversal of 390978430 is 34879093.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390978431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122029 + ... + 125191.

It is an arithmetic number, because the mean of its divisors is an integer number (22552992).

Almost surely, 2^390978430 is an apocalyptic number.

390978430 is a deficient number, since it is larger than the sum of its proper divisors (330717314).

390978430 is a wasteful number, since it uses less digits than its factorization.

390978430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3480.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 390978430 is about 19773.1745048690. The cubic root of 390978430 is about 731.2248343544.

The spelling of 390978430 in words is "three hundred ninety million, nine hundred seventy-eight thousand, four hundred thirty".