18021826938 has 16 divisors (see below), whose sum is σ = 36318797856. Its totient is φ = 5961418320.

The previous prime is 18021826937. The next prime is 18021826943. The reversal of 18021826938 is 83962812081.

It is not an unprimeable number, because it can be changed into a prime (18021826931) 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, 11463481 + ... + 11465052.

It is an arithmetic number, because the mean of its divisors is an integer number (2269924866).

Almost surely, 2^18021826938 is an apocalyptic number.

18021826938 is an abundant number, since it is smaller than the sum of its proper divisors (18296970918).

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

18021826938 is a wasteful number, since it uses less digits than its factorization.

18021826938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22928669.

The product of its (nonzero) digits is 331776, while the sum is 48.

The spelling of 18021826938 in words is "eighteen billion, twenty-one million, eight hundred twenty-six thousand, nine hundred thirty-eight".