399861588 has 96 divisors (see below), whose sum is σ = 1099651840. Its totient is φ = 110730240.

The previous prime is 399861559. The next prime is 399861611. The reversal of 399861588 is 885168993.

Its product of digits (3732480) is a multiple of the sum of its prime divisors (1215).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 373518 + ... + 374586.

Almost surely, 2^399861588 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 399861588, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (549825920).

399861588 is an abundant number, since it is smaller than the sum of its proper divisors (699790252).

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

399861588 is a wasteful number, since it uses less digits than its factorization.

399861588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1217 (or 1215 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 57.

The square root of 399861588 is about 19996.5394006063. The cubic root of 399861588 is about 736.7213042290.

The spelling of 399861588 in words is "three hundred ninety-nine million, eight hundred sixty-one thousand, five hundred eighty-eight".