390204979 has 2 divisors, whose sum is σ = 390204980. Its totient is φ = 390204978.

The previous prime is 390204949. The next prime is 390205003. The reversal of 390204979 is 979402093.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 390204979 - 2¹⁷ = 390073907 is a prime.

It is not a weakly prime, because it can be changed into another prime (390204949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195102489 + 195102490.

It is an arithmetic number, because the mean of its divisors is an integer number (195102490).

Almost surely, 2^390204979 is an apocalyptic number.

390204979 is a deficient number, since it is larger than the sum of its proper divisors (1).

390204979 is an equidigital number, since it uses as much as digits as its factorization.

390204979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 390204979 is about 19753.6067339613. The cubic root of 390204979 is about 730.7423355008.

The spelling of 390204979 in words is "three hundred ninety million, two hundred four thousand, nine hundred seventy-nine".