399890799 has 24 divisors (see below), whose sum is σ = 720150912. Its totient is φ = 207735120.

The previous prime is 399890767. The next prime is 399890801. The reversal of 399890799 is 997098993.

It is not a de Polignac number, because 399890799 - 2⁵ = 399890767 is a prime.

It is a super-2 number, since 2×399890799² = 319825302249716802, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399890759) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 287829 + ... + 289214.

It is an arithmetic number, because the mean of its divisors is an integer number (30006288).

Almost surely, 2^399890799 is an apocalyptic number.

399890799 is a deficient number, since it is larger than the sum of its proper divisors (320260113).

399890799 is a wasteful number, since it uses less digits than its factorization.

399890799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577067 (or 577064 counting only the distinct ones).

The product of its (nonzero) digits is 9920232, while the sum is 63.

The square root of 399890799 is about 19997.2697886486. The cubic root of 399890799 is about 736.7392436383.

It can be divided in two parts, 399890 and 799, that added together give a square (400689 = 633²).

The spelling of 399890799 in words is "three hundred ninety-nine million, eight hundred ninety thousand, seven hundred ninety-nine".