399028869 has 16 divisors (see below), whose sum is σ = 610224640. Its totient is φ = 257437440.

The previous prime is 399028849. The next prime is 399028871. The reversal of 399028869 is 968820993.

It is not a de Polignac number, because 399028869 - 2⁸ = 399028613 is a prime.

It is a super-2 number, since 2×399028869² = 318448076590838322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399028849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237532 + ... + 239205.

It is an arithmetic number, because the mean of its divisors is an integer number (38139040).

Almost surely, 2^399028869 is an apocalyptic number.

It is an amenable number.

399028869 is a deficient number, since it is larger than the sum of its proper divisors (211195771).

399028869 is a wasteful number, since it uses less digits than its factorization.

399028869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476777 (or 476771 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The square root of 399028869 is about 19975.7069712188. The cubic root of 399028869 is about 736.2095369893.

The spelling of 399028869 in words is "three hundred ninety-nine million, twenty-eight thousand, eight hundred sixty-nine".