18041538 has 16 divisors (see below), whose sum is σ = 37327680. Its totient is φ = 5806416.

The previous prime is 18041531. The next prime is 18041549. The reversal of 18041538 is 83514081.

It is not an unprimeable number, because it can be changed into a prime (18041531) 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, 51670 + ... + 52017.

It is an arithmetic number, because the mean of its divisors is an integer number (2332980).

Almost surely, 2^18041538 is an apocalyptic number.

18041538 is an abundant number, since it is smaller than the sum of its proper divisors (19286142).

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

18041538 is a wasteful number, since it uses less digits than its factorization.

18041538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103721.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 18041538 is about 4247.5331664391. The cubic root of 18041538 is about 262.2755778013.

The spelling of 18041538 in words is "eighteen million, forty-one thousand, five hundred thirty-eight".