390641879 has 2 divisors, whose sum is σ = 390641880. Its totient is φ = 390641878.

The previous prime is 390641857. The next prime is 390641899. The reversal of 390641879 is 978146093.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 390641879 - 2¹² = 390637783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390641899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195320939 + 195320940.

It is an arithmetic number, because the mean of its divisors is an integer number (195320940).

Almost surely, 2^390641879 is an apocalyptic number.

390641879 is a deficient number, since it is larger than the sum of its proper divisors (1).

390641879 is an equidigital number, since it uses as much as digits as its factorization.

390641879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 390641879 is about 19764.6623801167. The cubic root of 390641879 is about 731.0149633606.

The spelling of 390641879 in words is "three hundred ninety million, six hundred forty-one thousand, eight hundred seventy-nine".