399661882 has 8 divisors (see below), whose sum is σ = 600340500. Its totient is φ = 199548384.

The previous prime is 399661861. The next prime is 399661897. The reversal of 399661882 is 288166993.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 399560121 + 101761 = 19989^2 + 319^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139507 + ... + 142342.

Almost surely, 2^399661882 is an apocalyptic number.

399661882 is a deficient number, since it is larger than the sum of its proper divisors (200678618).

399661882 is a wasteful number, since it uses less digits than its factorization.

399661882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282560.

The product of its digits is 1119744, while the sum is 52.

The square root of 399661882 is about 19991.5452629355. The cubic root of 399661882 is about 736.5986349774.

The spelling of 399661882 in words is "three hundred ninety-nine million, six hundred sixty-one thousand, eight hundred eighty-two".