399555100 has 72 divisors (see below), whose sum is σ = 993860000. Its totient is φ = 136581120.

The previous prime is 399555089. The next prime is 399555133. The reversal of 399555100 is 1555993.

It is a self number, because there is not a number n which added to its sum of digits gives 399555100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 319276 + ... + 320524.

Almost surely, 2^399555100 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399555100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (496930000).

399555100 is an abundant number, since it is smaller than the sum of its proper divisors (594304900).

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

399555100 is a wasteful number, since it uses less digits than its factorization.

399555100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1727 (or 1720 counting only the distinct ones).

The product of its (nonzero) digits is 30375, while the sum is 37.

The square root of 399555100 is about 19988.8744055287. The cubic root of 399555100 is about 736.5330274517.

It can be divided in two parts, 3995 and 55100, that added together give a palindrome (59095).

The spelling of 399555100 in words is "three hundred ninety-nine million, five hundred fifty-five thousand, one hundred".