399099499 has 2 divisors, whose sum is σ = 399099500. Its totient is φ = 399099498.

The previous prime is 399099443. The next prime is 399099517. The reversal of 399099499 is 994990993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 399099499 - 2²³ = 390710891 is a prime.

It is not a weakly prime, because it can be changed into another prime (399096499) 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, 199549749 + 199549750.

It is an arithmetic number, because the mean of its divisors is an integer number (199549750).

Almost surely, 2^399099499 is an apocalyptic number.

399099499 is a deficient number, since it is larger than the sum of its proper divisors (1).

399099499 is an equidigital number, since it uses as much as digits as its factorization.

399099499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6377292, while the sum is 61.

The square root of 399099499 is about 19977.4747903733. The cubic root of 399099499 is about 736.2529719518.

The spelling of 399099499 in words is "three hundred ninety-nine million, ninety-nine thousand, four hundred ninety-nine".