390923 has 4 divisors (see below), whose sum is σ = 421008. Its totient is φ = 360840.

The previous prime is 390893. The next prime is 390953. The reversal of 390923 is 329093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 329093 = 191 ⋅1723.

It is an interprime number because it is at equal distance from previous prime (390893) and next prime (390953).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390923 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 390892 and 390901.

It is not an unprimeable number, because it can be changed into a prime (390953) 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, 15023 + ... + 15048.

It is an arithmetic number, because the mean of its divisors is an integer number (105252).

2³⁹⁰⁹²³ is an apocalyptic number.

390923 is a deficient number, since it is larger than the sum of its proper divisors (30085).

390923 is a wasteful number, since it uses less digits than its factorization.

390923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30084.

The product of its (nonzero) digits is 1458, while the sum is 26.

The square root of 390923 is about 625.2383545497. The cubic root of 390923 is about 73.1190276857.

The spelling of 390923 in words is "three hundred ninety thousand, nine hundred twenty-three".