390638 has 4 divisors (see below), whose sum is σ = 585960. Its totient is φ = 195318.

The previous prime is 390581. The next prime is 390647. The reversal of 390638 is 836093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 836093 = 67 ⋅12479.

It is a self number, because there is not a number n which added to its sum of digits gives 390638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97658 + ... + 97661.

It is an arithmetic number, because the mean of its divisors is an integer number (146490).

2³⁹⁰⁶³⁸ is an apocalyptic number.

390638 is a deficient number, since it is larger than the sum of its proper divisors (195322).

390638 is a wasteful number, since it uses less digits than its factorization.

390638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195321.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 390638 is about 625.0103999135. The cubic root of 390638 is about 73.1012543739.

The spelling of 390638 in words is "three hundred ninety thousand, six hundred thirty-eight".