399984732 has 144 divisors (see below), whose sum is σ = 1227116800. Its totient is φ = 107308800.

The previous prime is 399984731. The next prime is 399984757. The reversal of 399984732 is 237489993.

It is a super-2 number, since 2×399984732² = 319975571666223648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399984731) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 665232 + ... + 665832.

Almost surely, 2^399984732 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 399984732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (613558400).

399984732 is an abundant number, since it is smaller than the sum of its proper divisors (827132068).

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

399984732 is a wasteful number, since it uses less digits than its factorization.

399984732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776 (or 771 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 54.

The square root of 399984732 is about 19999.6182963576. The cubic root of 399984732 is about 736.7969249766.

The spelling of 399984732 in words is "three hundred ninety-nine million, nine hundred eighty-four thousand, seven hundred thirty-two".