399224690 has 8 divisors (see below), whose sum is σ = 718604460. Its totient is φ = 159689872.

The previous prime is 399224681. The next prime is 399224717. The reversal of 399224690 is 96422993.

It can be written as a sum of positive squares in 2 ways, for example, as 398281849 + 942841 = 19957^2 + 971^2 .

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

It is a super-2 number, since 2×399224690² = 318760706211192200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19961225 + ... + 19961244.

Almost surely, 2^399224690 is an apocalyptic number.

399224690 is a deficient number, since it is larger than the sum of its proper divisors (319379770).

399224690 is a wasteful number, since it uses less digits than its factorization.

399224690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39922476.

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 399224690 is about 19980.6078486116. The cubic root of 399224690 is about 736.3299474179.

It can be divided in two parts, 3992 and 24690, that added together give a palindrome (28682).

The spelling of 399224690 in words is "three hundred ninety-nine million, two hundred twenty-four thousand, six hundred ninety".