399867228 has 36 divisors (see below), whose sum is σ = 1014449800. Its totient is φ = 132804576.

The previous prime is 399867227. The next prime is 399867241. The reversal of 399867228 is 822768993.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399867227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10078 + ... + 30021.

Almost surely, 2^399867228 is an apocalyptic number.

It is an amenable number.

399867228 is an abundant number, since it is smaller than the sum of its proper divisors (614582572).

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

399867228 is a wasteful number, since it uses less digits than its factorization.

399867228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40386 (or 40381 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 399867228 is about 19996.6804245105. The cubic root of 399867228 is about 736.7247680014.

The spelling of 399867228 in words is "three hundred ninety-nine million, eight hundred sixty-seven thousand, two hundred twenty-eight".