399226566 has 16 divisors (see below), whose sum is σ = 799009344. Its totient is φ = 132982824.

The previous prime is 399226549. The next prime is 399226567. The reversal of 399226566 is 665622993.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399226567) 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, 13536 + ... + 31331.

It is an arithmetic number, because the mean of its divisors is an integer number (49938084).

Almost surely, 2^399226566 is an apocalyptic number.

399226566 is an abundant number, since it is smaller than the sum of its proper divisors (399782778).

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

399226566 is a wasteful number, since it uses less digits than its factorization.

399226566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46355.

The product of its digits is 1049760, while the sum is 48.

The square root of 399226566 is about 19980.6547940752. The cubic root of 399226566 is about 736.3311007808.

The spelling of 399226566 in words is "three hundred ninety-nine million, two hundred twenty-six thousand, five hundred sixty-six".