18336973938 has 16 divisors (see below), whose sum is σ = 36834098880. Its totient is φ = 6085632816.

The previous prime is 18336973933. The next prime is 18336973939. The reversal of 18336973938 is 83937963381.

It is a super-2 number, since 2×18336973938² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18336973931) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6671470 + ... + 6674217.

It is an arithmetic number, because the mean of its divisors is an integer number (2302131180).

Almost surely, 2^18336973938 is an apocalyptic number.

18336973938 is an abundant number, since it is smaller than the sum of its proper divisors (18497124942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18336973938 is a wasteful number, since it uses less digits than its factorization.

18336973938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13345921.

The product of its digits is 17635968, while the sum is 60.

The spelling of 18336973938 in words is "eighteen billion, three hundred thirty-six million, nine hundred seventy-three thousand, nine hundred thirty-eight".