399221002 has 8 divisors (see below), whose sum is σ = 604325700. Its totient is φ = 197779104.

The previous prime is 399220999. The next prime is 399221023. The reversal of 399221002 is 200122993.

It can be written as a sum of positive squares in 2 ways, for example, as 396368281 + 2852721 = 19909^2 + 1689^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 915427 + ... + 915862.

Almost surely, 2^399221002 is an apocalyptic number.

399221002 is a deficient number, since it is larger than the sum of its proper divisors (205104698).

399221002 is a wasteful number, since it uses less digits than its factorization.

399221002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1831400.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 399221002 is about 19980.5155589139. The cubic root of 399221002 is about 736.3276800288.

Adding to 399221002 its reverse (200122993), we get a palindrome (599343995).

The spelling of 399221002 in words is "three hundred ninety-nine million, two hundred twenty-one thousand, two".