18540536 has 16 divisors (see below), whose sum is σ = 39729840. Its totient is φ = 7945920.

The previous prime is 18540521. The next prime is 18540539. The reversal of 18540536 is 63504581.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18540539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165485 + ... + 165596.

It is an arithmetic number, because the mean of its divisors is an integer number (2483115).

Almost surely, 2^18540536 is an apocalyptic number.

It is an amenable number.

18540536 is an abundant number, since it is smaller than the sum of its proper divisors (21189304).

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

18540536 is a wasteful number, since it uses less digits than its factorization.

18540536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331094 (or 331090 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 18540536 is about 4305.8722693550. The cubic root of 18540536 is about 264.6716521876.

The spelling of 18540536 in words is "eighteen million, five hundred forty thousand, five hundred thirty-six".