390858961 has 2 divisors, whose sum is σ = 390858962. Its totient is φ = 390858960.

The previous prime is 390858913. The next prime is 390858967. The reversal of 390858961 is 169858093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 294328336 + 96530625 = 17156^2 + 9825^2 .

It is an emirp because it is prime and its reverse (169858093) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 390858961 - 2¹¹ = 390856913 is a prime.

It is not a weakly prime, because it can be changed into another prime (390858967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195429480 + 195429481.

It is an arithmetic number, because the mean of its divisors is an integer number (195429481).

Almost surely, 2^390858961 is an apocalyptic number.

It is an amenable number.

390858961 is a deficient number, since it is larger than the sum of its proper divisors (1).

390858961 is an equidigital number, since it uses as much as digits as its factorization.

390858961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 390858961 is about 19770.1532872156. The cubic root of 390858961 is about 731.1503480636.

The spelling of 390858961 in words is "three hundred ninety million, eight hundred fifty-eight thousand, nine hundred sixty-one".