390386977 has 4 divisors (see below), whose sum is σ = 410933680. Its totient is φ = 369840276.

The previous prime is 390386959. The next prime is 390386993. The reversal of 390386977 is 779683093.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390386977 is a prime.

It is a super-2 number, since 2×390386977² = 304803983622397058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390386947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10273323 + ... + 10273360.

It is an arithmetic number, because the mean of its divisors is an integer number (102733420).

Almost surely, 2^390386977 is an apocalyptic number.

It is an amenable number.

390386977 is a deficient number, since it is larger than the sum of its proper divisors (20546703).

390386977 is a wasteful number, since it uses less digits than its factorization.

390386977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20546702.

The product of its (nonzero) digits is 1714608, while the sum is 52.

The square root of 390386977 is about 19758.2128999563. The cubic root of 390386977 is about 730.8559279110.

The spelling of 390386977 in words is "three hundred ninety million, three hundred eighty-six thousand, nine hundred seventy-seven".