390421859 has 2 divisors, whose sum is σ = 390421860. Its totient is φ = 390421858.

The previous prime is 390421831. The next prime is 390421873. The reversal of 390421859 is 958124093.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390421859 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (390421819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195210929 + 195210930.

It is an arithmetic number, because the mean of its divisors is an integer number (195210930).

Almost surely, 2^390421859 is an apocalyptic number.

390421859 is a deficient number, since it is larger than the sum of its proper divisors (1).

390421859 is an equidigital number, since it uses as much as digits as its factorization.

390421859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 390421859 is about 19759.0956017729. The cubic root of 390421859 is about 730.8776951648.

The spelling of 390421859 in words is "three hundred ninety million, four hundred twenty-one thousand, eight hundred fifty-nine".