399581072 has 40 divisors (see below), whose sum is σ = 871825152. Its totient is φ = 175766400.

The previous prime is 399581071. The next prime is 399581081. The reversal of 399581072 is 270185993.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (399581071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31163 + ... + 42074.

Almost surely, 2^399581072 is an apocalyptic number.

It is an amenable number.

399581072 is an abundant number, since it is smaller than the sum of its proper divisors (472244080).

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

399581072 is a wasteful number, since it uses less digits than its factorization.

399581072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73287 (or 73281 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 399581072 is about 19989.5240563651. The cubic root of 399581072 is about 736.5489858859.

The spelling of 399581072 in words is "three hundred ninety-nine million, five hundred eighty-one thousand, seventy-two".