17939230856 has 16 divisors (see below), whose sum is σ = 34456450140. Its totient is φ = 8750844160.

The previous prime is 17939230819. The next prime is 17939230871. The reversal of 17939230856 is 65803293971.

It can be written as a sum of positive squares in 2 ways, for example, as 16367108356 + 1572122500 = 127934^2 + 39650^2 .

It is a junction number, because it is equal to n+sod(n) for n = 17939230798 and 17939230807.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27346061 + ... + 27346716.

Almost surely, 2^17939230856 is an apocalyptic number.

It is an amenable number.

17939230856 is a deficient number, since it is larger than the sum of its proper divisors (16517219284).

17939230856 is a wasteful number, since it uses less digits than its factorization.

17939230856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54692824 (or 54692820 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 53.

The spelling of 17939230856 in words is "seventeen billion, nine hundred thirty-nine million, two hundred thirty thousand, eight hundred fifty-six".