18918139306 has 16 divisors (see below), whose sum is σ = 31230914688. Its totient is φ = 8523054400.

The previous prime is 18918139301. The next prime is 18918139319. The reversal of 18918139306 is 60393181981.

It is a self number, because there is not a number n which added to its sum of digits gives 18918139306.

It is not an unprimeable number, because it can be changed into a prime (18918139301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3802450 + ... + 3807421.

It is an arithmetic number, because the mean of its divisors is an integer number (1951932168).

Almost surely, 2^18918139306 is an apocalyptic number.

18918139306 is a deficient number, since it is larger than the sum of its proper divisors (12312775382).

18918139306 is a wasteful number, since it uses less digits than its factorization.

18918139306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7609997.

The product of its (nonzero) digits is 279936, while the sum is 49.

The spelling of 18918139306 in words is "eighteen billion, nine hundred eighteen million, one hundred thirty-nine thousand, three hundred six".