390386431 has 2 divisors, whose sum is σ = 390386432. Its totient is φ = 390386430.

The previous prime is 390386363. The next prime is 390386473. The reversal of 390386431 is 134683093.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 390386431 - 2¹¹ = 390384383 is a prime.

It is a super-2 number, since 2×390386431² = 304803131017835522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390386531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195193215 + 195193216.

It is an arithmetic number, because the mean of its divisors is an integer number (195193216).

Almost surely, 2^390386431 is an apocalyptic number.

390386431 is a deficient number, since it is larger than the sum of its proper divisors (1).

390386431 is an equidigital number, since it uses as much as digits as its factorization.

390386431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 390386431 is about 19758.1990829124. The cubic root of 390386431 is about 730.8555871829.

The spelling of 390386431 in words is "three hundred ninety million, three hundred eighty-six thousand, four hundred thirty-one".