399721082 has 8 divisors (see below), whose sum is σ = 599666976. Its totient is φ = 199832092.

The previous prime is 399721081. The next prime is 399721109. The reversal of 399721082 is 280127993.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (399721081) 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, 17393 + ... + 33195.

It is an arithmetic number, because the mean of its divisors is an integer number (74958372).

Almost surely, 2^399721082 is an apocalyptic number.

399721082 is a deficient number, since it is larger than the sum of its proper divisors (199945894).

399721082 is a wasteful number, since it uses less digits than its factorization.

399721082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28452.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 399721082 is about 19993.0258340252. The cubic root of 399721082 is about 736.6350027908.

The spelling of 399721082 in words is "three hundred ninety-nine million, seven hundred twenty-one thousand, eighty-two".