399880869 has 8 divisors (see below), whose sum is σ = 533287872. Its totient is φ = 266530560.

The previous prime is 399880849. The next prime is 399880879. The reversal of 399880869 is 968088993.

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

It is not a de Polignac number, because 399880869 - 2⁵ = 399880837 is a prime.

It is a super-2 number, since 2×399880869² = 319809418784390322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399880849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6664 + ... + 29054.

It is an arithmetic number, because the mean of its divisors is an integer number (66660984).

Almost surely, 2^399880869 is an apocalyptic number.

It is an amenable number.

399880869 is a deficient number, since it is larger than the sum of its proper divisors (133407003).

399880869 is a wasteful number, since it uses less digits than its factorization.

399880869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28347.

The product of its (nonzero) digits is 6718464, while the sum is 60.

The square root of 399880869 is about 19997.0215032139. The cubic root of 399880869 is about 736.7331454057.

The spelling of 399880869 in words is "three hundred ninety-nine million, eight hundred eighty thousand, eight hundred sixty-nine".