399511632 has 160 divisors (see below), whose sum is σ = 1208811520. Its totient is φ = 112596480.

The previous prime is 399511621. The next prime is 399511639. The reversal of 399511632 is 236115993.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399511639) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 366993 + ... + 368079.

It is an arithmetic number, because the mean of its divisors is an integer number (7555072).

Almost surely, 2^399511632 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 399511632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (604405760).

399511632 is an abundant number, since it is smaller than the sum of its proper divisors (809299888).

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

399511632 is a wasteful number, since it uses less digits than its factorization.

399511632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161 (or 1155 counting only the distinct ones).

The product of its digits is 43740, while the sum is 39.

The square root of 399511632 is about 19987.7870711092. The cubic root of 399511632 is about 736.5063170942.

The spelling of 399511632 in words is "three hundred ninety-nine million, five hundred eleven thousand, six hundred thirty-two".