399442132 has 48 divisors (see below), whose sum is σ = 760551120. Its totient is φ = 182853632.

The previous prime is 399442129. The next prime is 399442151. The reversal of 399442132 is 231244993.

It can be written as a sum of positive squares in 8 ways, for example, as 99321156 + 300120976 = 9966^2 + 17324^2 .

It is a super-3 number, since 3×399442132³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 399442091 and 399442100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 493344 + ... + 494152.

It is an arithmetic number, because the mean of its divisors is an integer number (15844815).

Almost surely, 2^399442132 is an apocalyptic number.

It is an amenable number.

399442132 is a deficient number, since it is larger than the sum of its proper divisors (361108988).

399442132 is a wasteful number, since it uses less digits than its factorization.

399442132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020 (or 1018 counting only the distinct ones).

The product of its digits is 46656, while the sum is 37.

The square root of 399442132 is about 19986.0484338450. The cubic root of 399442132 is about 736.4636064833.

The spelling of 399442132 in words is "three hundred ninety-nine million, four hundred forty-two thousand, one hundred thirty-two".