399865299 has 8 divisors (see below), whose sum is σ = 545552832. Its totient is φ = 260377320.

The previous prime is 399865273. The next prime is 399865307. The reversal of 399865299 is 992568993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 399865299 - 2²⁰ = 398816723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399865399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1549737 + ... + 1549994.

It is an arithmetic number, because the mean of its divisors is an integer number (68194104).

Almost surely, 2^399865299 is an apocalyptic number.

399865299 is a deficient number, since it is larger than the sum of its proper divisors (145687533).

399865299 is a wasteful number, since it uses less digits than its factorization.

399865299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3099777.

The product of its digits is 9447840, while the sum is 60.

The square root of 399865299 is about 19996.6321914466. The cubic root of 399865299 is about 736.7235833212.

The spelling of 399865299 in words is "three hundred ninety-nine million, eight hundred sixty-five thousand, two hundred ninety-nine".