399665982 has 8 divisors (see below), whose sum is σ = 799331976. Its totient is φ = 133221992.

The previous prime is 399665953. The next prime is 399665983. The reversal of 399665982 is 289566993.

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

399665982 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399665983) 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, 33305493 + ... + 33305504.

It is an arithmetic number, because the mean of its divisors is an integer number (99916497).

Almost surely, 2^399665982 is an apocalyptic number.

399665982 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

399665982 is a wasteful number, since it uses less digits than its factorization.

399665982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66611002.

The product of its digits is 6298560, while the sum is 57.

The square root of 399665982 is about 19991.6478060214. The cubic root of 399665982 is about 736.6011538099.

The spelling of 399665982 in words is "three hundred ninety-nine million, six hundred sixty-five thousand, nine hundred eighty-two".