18836873540 has 24 divisors (see below), whose sum is σ = 40522251672. Its totient is φ = 7350974720.

The previous prime is 18836873513. The next prime is 18836873563. The reversal of 18836873540 is 4537863881.

It can be written as a sum of positive squares in 4 ways, for example, as 445716544 + 18391156996 = 21112^2 + 135614^2 .

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, 11485079 + ... + 11486718.

It is an arithmetic number, because the mean of its divisors is an integer number (1688427153).

Almost surely, 2^18836873540 is an apocalyptic number.

18836873540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18836873540 is an abundant number, since it is smaller than the sum of its proper divisors (21685378132).

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

18836873540 is a wasteful number, since it uses less digits than its factorization.

18836873540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22971847 (or 22971845 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 53.

The spelling of 18836873540 in words is "eighteen billion, eight hundred thirty-six million, eight hundred seventy-three thousand, five hundred forty".