399009107 has 6 divisors (see below), whose sum is σ = 464153508. Its totient is φ = 342007764.

The previous prime is 399009097. The next prime is 399009131. The reversal of 399009107 is 701900993.

It is a happy number.

It is not a de Polignac number, because 399009107 - 2⁶ = 399009043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399009197) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4071473 + ... + 4071570.

It is an arithmetic number, because the mean of its divisors is an integer number (77358918).

Almost surely, 2^399009107 is an apocalyptic number.

399009107 is a deficient number, since it is larger than the sum of its proper divisors (65144401).

399009107 is an equidigital number, since it uses as much as digits as its factorization.

399009107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8143057 (or 8143050 counting only the distinct ones).

The product of its (nonzero) digits is 15309, while the sum is 38.

The square root of 399009107 is about 19975.2123142659. The cubic root of 399009107 is about 736.1973831377.

The spelling of 399009107 in words is "three hundred ninety-nine million, nine thousand, one hundred seven".