399899136 has 160 divisors (see below), whose sum is σ = 1311666048. Its totient is φ = 105431040.

The previous prime is 399899131. The next prime is 399899141. The reversal of 399899136 is 631998993.

It is an interprime number because it is at equal distance from previous prime (399899131) and next prime (399899141).

It is a zygodrome in base 4.

It is not an unprimeable number, because it can be changed into a prime (399899131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138346 + ... + 141206.

Almost surely, 2^399899136 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 399899136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (655833024).

399899136 is an abundant number, since it is smaller than the sum of its proper divisors (911766912).

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

399899136 is a wasteful number, since it uses less digits than its factorization.

399899136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2902 (or 2886 counting only the distinct ones).

The product of its digits is 2834352, while the sum is 57.

The square root of 399899136 is about 19997.4782410183. The cubic root of 399899136 is about 736.7443634963.

The spelling of 399899136 in words is "three hundred ninety-nine million, eight hundred ninety-nine thousand, one hundred thirty-six".