398961707 has 2 divisors, whose sum is σ = 398961708. Its totient is φ = 398961706.

The previous prime is 398961683. The next prime is 398961721. The reversal of 398961707 is 707169893.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 398961707 - 2⁶ = 398961643 is a prime.

It is not a weakly prime, because it can be changed into another prime (398961757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199480853 + 199480854.

It is an arithmetic number, because the mean of its divisors is an integer number (199480854).

Almost surely, 2^398961707 is an apocalyptic number.

398961707 is a deficient number, since it is larger than the sum of its proper divisors (1).

398961707 is an equidigital number, since it uses as much as digits as its factorization.

398961707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 571536, while the sum is 50.

The square root of 398961707 is about 19974.0258085344. The cubic root of 398961707 is about 736.1682299703.

The spelling of 398961707 in words is "three hundred ninety-eight million, nine hundred sixty-one thousand, seven hundred seven".