390406983 has 4 divisors (see below), whose sum is σ = 520542648. Its totient is φ = 260271320.

The previous prime is 390406981. The next prime is 390406987. The reversal of 390406983 is 389604093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 389604093 = 3 ⋅129868031.

It is a cyclic number.

It is not a de Polignac number, because 390406983 - 2¹ = 390406981 is a prime.

It is a super-2 number, since 2×390406983² = 304835224750324578, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390406981) 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, 65067828 + ... + 65067833.

It is an arithmetic number, because the mean of its divisors is an integer number (130135662).

Almost surely, 2^390406983 is an apocalyptic number.

390406983 is a deficient number, since it is larger than the sum of its proper divisors (130135665).

390406983 is a wasteful number, since it uses less digits than its factorization.

390406983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130135664.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 390406983 is about 19758.7191639539. The cubic root of 390406983 is about 730.8684123216.

The spelling of 390406983 in words is "three hundred ninety million, four hundred six thousand, nine hundred eighty-three".