390520890 has 48 divisors (see below), whose sum is σ = 1030524768. Its totient is φ = 102583008.

The previous prime is 390520877. The next prime is 390520901. The reversal of 390520890 is 98025093.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26352 + ... + 38411.

It is an arithmetic number, because the mean of its divisors is an integer number (21469266).

Almost surely, 2^390520890 is an apocalyptic number.

390520890 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

390520890 is an abundant number, since it is smaller than the sum of its proper divisors (640003878).

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

390520890 is a wasteful number, since it uses less digits than its factorization.

390520890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64843 (or 64840 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 390520890 is about 19761.6014027204. The cubic root of 390520890 is about 730.9394859590.

The spelling of 390520890 in words is "three hundred ninety million, five hundred twenty thousand, eight hundred ninety".