399607272 has 72 divisors (see below), whose sum is σ = 1095207750. Its totient is φ = 131622912.

The previous prime is 399607249. The next prime is 399607291. The reversal of 399607272 is 272706993.

It is a happy number.

399607272 is a `hidden beast` number, since 39 + 9 + 607 + 2 + 7 + 2 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 161645796 + 237961476 = 12714^2 + 15426^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2070408 + ... + 2070600.

Almost surely, 2^399607272 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 399607272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (547603875).

399607272 is an abundant number, since it is smaller than the sum of its proper divisors (695600478).

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

399607272 is a wasteful number, since it uses less digits than its factorization.

399607272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547 (or 347 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 45.

The square root of 399607272 is about 19990.1793888899. The cubic root of 399607272 is about 736.5650837135.

The spelling of 399607272 in words is "three hundred ninety-nine million, six hundred seven thousand, two hundred seventy-two".