390407923 has 4 divisors (see below), whose sum is σ = 390523000. Its totient is φ = 390292848.

The previous prime is 390407867. The next prime is 390407939. The reversal of 390407923 is 329704093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 329704093 = 19 ⋅17352847.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390407923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390407123) 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, 52290 + ... + 59287.

It is an arithmetic number, because the mean of its divisors is an integer number (97630750).

Almost surely, 2^390407923 is an apocalyptic number.

390407923 is a deficient number, since it is larger than the sum of its proper divisors (115077).

390407923 is a wasteful number, since it uses less digits than its factorization.

390407923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115076.

The product of its (nonzero) digits is 40824, while the sum is 37.

The square root of 390407923 is about 19758.7429509066. The cubic root of 390407923 is about 730.8689989025.

The spelling of 390407923 in words is "three hundred ninety million, four hundred seven thousand, nine hundred twenty-three".