18989146724 has 12 divisors (see below), whose sum is σ = 33238150764. Its totient is φ = 9492532224.

The previous prime is 18989146717. The next prime is 18989146733. The reversal of 18989146724 is 42764198981.

It can be written as a sum of positive squares in 2 ways, for example, as 12047257600 + 6941889124 = 109760^2 + 83318^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 489257 + ... + 526640.

It is an arithmetic number, because the mean of its divisors is an integer number (2769845897).

Almost surely, 2^18989146724 is an apocalyptic number.

It is an amenable number.

18989146724 is a deficient number, since it is larger than the sum of its proper divisors (14249004040).

18989146724 is a wasteful number, since it uses less digits than its factorization.

18989146724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020574 (or 1020572 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 59.

The spelling of 18989146724 in words is "eighteen billion, nine hundred eighty-nine million, one hundred forty-six thousand, seven hundred twenty-four".