390993626 has 4 divisors (see below), whose sum is σ = 586490442. Its totient is φ = 195496812.

The previous prime is 390993623. The next prime is 390993637. The reversal of 390993626 is 626399093.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 344139601 + 46854025 = 18551^2 + 6845^2 .

It is not an unprimeable number, because it can be changed into a prime (390993623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97748405 + ... + 97748408.

Almost surely, 2^390993626 is an apocalyptic number.

390993626 is a deficient number, since it is larger than the sum of its proper divisors (195496816).

390993626 is a wasteful number, since it uses less digits than its factorization.

390993626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195496815.

The product of its (nonzero) digits is 472392, while the sum is 47.

The square root of 390993626 is about 19773.5587591106. The cubic root of 390993626 is about 731.2343076380.

The spelling of 390993626 in words is "three hundred ninety million, nine hundred ninety-three thousand, six hundred twenty-six".