399669120 has 256 divisors, whose sum is σ = 1435752000. Its totient is φ = 105062400.

The previous prime is 399669119. The next prime is 399669157. The reversal of 399669120 is 21966993.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1745166 + ... + 1745394.

Almost surely, 2^399669120 is an apocalyptic number.

399669120 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399669120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (717876000).

399669120 is an abundant number, since it is smaller than the sum of its proper divisors (1036082880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399669120 is a wasteful number, since it uses less digits than its factorization.

399669120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 399669120 is about 19991.7262886425. The cubic root of 399669120 is about 736.6030816267.

The spelling of 399669120 in words is "three hundred ninety-nine million, six hundred sixty-nine thousand, one hundred twenty".