390520947 has 4 divisors (see below), whose sum is σ = 520694600. Its totient is φ = 260347296.

The previous prime is 390520939. The next prime is 390520951. The reversal of 390520947 is 749025093.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 390520947 - 2³ = 390520939 is a prime.

It is a super-2 number, since 2×390520947² = 305013220091553618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390520967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65086822 + ... + 65086827.

It is an arithmetic number, because the mean of its divisors is an integer number (130173650).

Almost surely, 2^390520947 is an apocalyptic number.

390520947 is a deficient number, since it is larger than the sum of its proper divisors (130173653).

390520947 is a wasteful number, since it uses less digits than its factorization.

390520947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130173652.

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 390520947 is about 19761.6028449111. The cubic root of 390520947 is about 730.9395215213.

The spelling of 390520947 in words is "three hundred ninety million, five hundred twenty thousand, nine hundred forty-seven".