399961224 has 48 divisors (see below), whose sum is σ = 1166556300. Its totient is φ = 123064704.

The previous prime is 399961217. The next prime is 399961249. The reversal of 399961224 is 422169993.

It is a happy number.

399961224 is a `hidden beast` number, since 3 + 9 + 9 + 9 + 612 + 24 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 390852900 + 9108324 = 19770^2 + 3018^2 .

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 399961224.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 212719 + ... + 214590.

Almost surely, 2^399961224 is an apocalyptic number.

It is an amenable number.

399961224 is an abundant number, since it is smaller than the sum of its proper divisors (766595076).

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

399961224 is a wasteful number, since it uses less digits than its factorization.

399961224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427334 (or 427327 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 399961224 is about 19999.0305765055. The cubic root of 399961224 is about 736.7824902911.

The spelling of 399961224 in words is "three hundred ninety-nine million, nine hundred sixty-one thousand, two hundred twenty-four".