18518136 has 128 divisors (see below), whose sum is σ = 58329600. Its totient is φ = 4769280.

The previous prime is 18518113. The next prime is 18518161. The reversal of 18518136 is 63181581.

18518136 is nontrivially palindromic in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 18518097 and 18518106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 133155 + ... + 133293.

It is an arithmetic number, because the mean of its divisors is an integer number (455700).

Almost surely, 2^18518136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18518136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29164800).

18518136 is an abundant number, since it is smaller than the sum of its proper divisors (39811464).

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

18518136 is a wasteful number, since it uses less digits than its factorization.

18518136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229 (or 225 counting only the distinct ones).

The product of its digits is 5760, while the sum is 33.

The square root of 18518136 is about 4303.2703842543. The cubic root of 18518136 is about 264.5650203513.

The spelling of 18518136 in words is "eighteen million, five hundred eighteen thousand, one hundred thirty-six".