390397880 has 64 divisors (see below), whose sum is σ = 913248000. Its totient is φ = 150036480.

The previous prime is 390397853. The next prime is 390397901. The reversal of 390397880 is 88793093.

It is a congruent number.

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, 183704 + ... + 185816.

It is an arithmetic number, because the mean of its divisors is an integer number (14269500).

Almost surely, 2^390397880 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 390397880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (456624000).

390397880 is an abundant number, since it is smaller than the sum of its proper divisors (522850120).

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

390397880 is a wasteful number, since it uses less digits than its factorization.

390397880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2304 (or 2300 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 390397880 is about 19758.4888086108. The cubic root of 390397880 is about 730.8627317992.

The spelling of 390397880 in words is "three hundred ninety million, three hundred ninety-seven thousand, eight hundred eighty".