39999499 has 2 divisors, whose sum is σ = 39999500. Its totient is φ = 39999498.

The previous prime is 39999473. The next prime is 39999511. The reversal of 39999499 is 99499993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39999499 - 2⁵ = 39999467 is a prime.

It is not a weakly prime, because it can be changed into another prime (39999299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19999749 + 19999750.

It is an arithmetic number, because the mean of its divisors is an integer number (19999750).

Almost surely, 2^39999499 is an apocalyptic number.

39999499 is a deficient number, since it is larger than the sum of its proper divisors (1).

39999499 is an equidigital number, since it uses as much as digits as its factorization.

39999499 is an evil number, because the sum of its binary digits is even.

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

The square root of 39999499 is about 6324.5157126850. The cubic root of 39999499 is about 341.9937614995.

The spelling of 39999499 in words is "thirty-nine million, nine hundred ninety-nine thousand, four hundred ninety-nine".