18307217938 has 16 divisors (see below), whose sum is σ = 28206682560. Its totient is φ = 8905054896.

The previous prime is 18307217897. The next prime is 18307217959. The reversal of 18307217938 is 83971270381.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18307217891 and 18307217900.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 926995 + ... + 946537.

It is an arithmetic number, because the mean of its divisors is an integer number (1762917660).

Almost surely, 2^18307217938 is an apocalyptic number.

18307217938 is a deficient number, since it is larger than the sum of its proper divisors (9899464622).

18307217938 is a wasteful number, since it uses less digits than its factorization.

18307217938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32241.

The product of its (nonzero) digits is 508032, while the sum is 49.

The spelling of 18307217938 in words is "eighteen billion, three hundred seven million, two hundred seventeen thousand, nine hundred thirty-eight".