399255552 has 72 divisors (see below), whose sum is σ = 1153176570. Its totient is φ = 133079040.

The previous prime is 399255547. The next prime is 399255583. The reversal of 399255552 is 255552993.

399255552 is a `hidden beast` number, since 3 + 9 + 92 + 5 + 5 + 552 = 666.

It can be written as a sum of positive squares in only one way, i.e., 364962816 + 34292736 = 19104^2 + 5856^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a junction number, because it is equal to n+sod(n) for n = 399255498 and 399255507.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7602 + ... + 29262.

Almost surely, 2^399255552 is an apocalyptic number.

399255552 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399255552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (576588285).

399255552 is an abundant number, since it is smaller than the sum of its proper divisors (753921018).

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

399255552 is a wasteful number, since it uses less digits than its factorization.

399255552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21689 (or 21666 counting only the distinct ones).

The product of its digits is 607500, while the sum is 45.

The square root of 399255552 is about 19981.3801325134. The cubic root of 399255552 is about 736.3489208848.

The spelling of 399255552 in words is "three hundred ninety-nine million, two hundred fifty-five thousand, five hundred fifty-two".