390479220 has 72 divisors (see below), whose sum is σ = 1186062696. Its totient is φ = 103986432.

The previous prime is 390479213. The next prime is 390479237. The reversal of 390479220 is 22974093.

390479220 is a `hidden beast` number, since 390 + 47 + 9 + 220 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 218921616 + 171557604 = 14796^2 + 13098^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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, 260794 + ... + 262286.

It is an arithmetic number, because the mean of its divisors is an integer number (16473093).

Almost surely, 2^390479220 is an apocalyptic number.

390479220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

390479220 is an abundant number, since it is smaller than the sum of its proper divisors (795583476).

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

390479220 is a wasteful number, since it uses less digits than its factorization.

390479220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2961 (or 2956 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 390479220 is about 19760.5470572047. The cubic root of 390479220 is about 730.9134870666.

The spelling of 390479220 in words is "three hundred ninety million, four hundred seventy-nine thousand, two hundred twenty".