399966228 has 48 divisors (see below), whose sum is σ = 1082040960. Its totient is φ = 127524672.

The previous prime is 399966227. The next prime is 399966239. The reversal of 399966228 is 822669993.

399966228 is a `hidden beast` number, since 3 + 9 + 9 + 9 + 6 + 622 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399966221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78025 + ... + 82992.

It is an arithmetic number, because the mean of its divisors is an integer number (22542520).

Almost surely, 2^399966228 is an apocalyptic number.

It is an amenable number.

399966228 is an abundant number, since it is smaller than the sum of its proper divisors (682074732).

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

399966228 is a wasteful number, since it uses less digits than its factorization.

399966228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161053 (or 161045 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 54.

The square root of 399966228 is about 19999.1556821782. The cubic root of 399966228 is about 736.7855629592.

The spelling of 399966228 in words is "three hundred ninety-nine million, nine hundred sixty-six thousand, two hundred twenty-eight".