399642088 has 16 divisors (see below), whose sum is σ = 767605860. Its totient is φ = 194947200.

The previous prime is 399642083. The next prime is 399642107. The reversal of 399642088 is 880246993.

It can be written as a sum of positive squares in 2 ways, for example, as 246427204 + 153214884 = 15698^2 + 12378^2 .

It is a super-3 number, since 3×399642088³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (399642083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 608883 + ... + 609538.

Almost surely, 2^399642088 is an apocalyptic number.

It is an amenable number.

399642088 is a deficient number, since it is larger than the sum of its proper divisors (367963772).

399642088 is a wasteful number, since it uses less digits than its factorization.

399642088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218468 (or 1218464 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 49.

The square root of 399642088 is about 19991.0501975259. The cubic root of 399642088 is about 736.5864743029.

The spelling of 399642088 in words is "three hundred ninety-nine million, six hundred forty-two thousand, eighty-eight".