390789431 has 2 divisors, whose sum is σ = 390789432. Its totient is φ = 390789430.

The previous prime is 390789361. The next prime is 390789439. The reversal of 390789431 is 134987093.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 390789431 - 2¹⁸ = 390527287 is a prime.

It is a super-2 number, since 2×390789431² = 305432758762607522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390789439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195394715 + 195394716.

It is an arithmetic number, because the mean of its divisors is an integer number (195394716).

Almost surely, 2^390789431 is an apocalyptic number.

390789431 is a deficient number, since it is larger than the sum of its proper divisors (1).

390789431 is an equidigital number, since it uses as much as digits as its factorization.

390789431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 390789431 is about 19768.3947502067. The cubic root of 390789431 is about 731.1069906521.

The spelling of 390789431 in words is "three hundred ninety million, seven hundred eighty-nine thousand, four hundred thirty-one".