399889040 has 80 divisors (see below), whose sum is σ = 984151296. Its totient is φ = 150796800.

The previous prime is 399889027. The next prime is 399889069. The reversal of 399889040 is 40988993.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×399889040² = 319822488624243200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 399889040.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129110 + ... + 132170.

Almost surely, 2^399889040 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 399889040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (492075648).

399889040 is an abundant number, since it is smaller than the sum of its proper divisors (584262256).

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

399889040 is a wasteful number, since it uses less digits than its factorization.

399889040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3168 (or 3162 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 399889040 is about 19997.2258075964. The cubic root of 399889040 is about 736.7381634048.

The spelling of 399889040 in words is "three hundred ninety-nine million, eight hundred eighty-nine thousand, forty".