390813986 has 8 divisors (see below), whose sum is σ = 620704620. Its totient is φ = 183912448.

The previous prime is 390813961. The next prime is 390814051. The reversal of 390813986 is 689318093.

It can be written as a sum of positive squares in 2 ways, for example, as 390813361 + 625 = 19769^2 + 25^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 390813986.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5747231 + ... + 5747298.

Almost surely, 2^390813986 is an apocalyptic number.

390813986 is a deficient number, since it is larger than the sum of its proper divisors (229890634).

390813986 is a wasteful number, since it uses less digits than its factorization.

390813986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11494548.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 390813986 is about 19769.0158075712. The cubic root of 390813986 is about 731.1223032089.

The spelling of 390813986 in words is "three hundred ninety million, eight hundred thirteen thousand, nine hundred eighty-six".