18002912538 has 16 divisors (see below), whose sum is σ = 38775504096. Its totient is φ = 5539357680.

The previous prime is 18002912497. The next prime is 18002912539. The reversal of 18002912538 is 83521920081.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 18002912496 and 18002912505.

It is not an unprimeable number, because it can be changed into a prime (18002912539) 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, 115403208 + ... + 115403363.

It is an arithmetic number, because the mean of its divisors is an integer number (2423469006).

Almost surely, 2^18002912538 is an apocalyptic number.

18002912538 is an abundant number, since it is smaller than the sum of its proper divisors (20772591558).

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

18002912538 is a wasteful number, since it uses less digits than its factorization.

18002912538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230806589.

The product of its (nonzero) digits is 34560, while the sum is 39.

The spelling of 18002912538 in words is "eighteen billion, two million, nine hundred twelve thousand, five hundred thirty-eight".