18518040 has 48 divisors (see below), whose sum is σ = 60184800. Its totient is φ = 4938048.

The previous prime is 18518039. The next prime is 18518051. The reversal of 18518040 is 4081581.

It is a junction number, because it is equal to n+sod(n) for n = 18517995 and 18518013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25360 + ... + 26079.

It is an arithmetic number, because the mean of its divisors is an integer number (1253850).

Almost surely, 2^18518040 is an apocalyptic number.

18518040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18518040 is an abundant number, since it is smaller than the sum of its proper divisors (41666760).

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

18518040 is a wasteful number, since it uses less digits than its factorization.

18518040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51456 (or 51449 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 18518040 is about 4303.2592299326. The cubic root of 18518040 is about 264.5645631727.

It can be divided in two parts, 185 and 18040, that added together give a square (18225 = 135²).

The spelling of 18518040 in words is "eighteen million, five hundred eighteen thousand, forty".