18138108 has 24 divisors (see below), whose sum is σ = 43782480. Its totient is φ = 5837440.

The previous prime is 18138101. The next prime is 18138119. The reversal of 18138108 is 80183181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18138101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25713 + ... + 26408.

It is an arithmetic number, because the mean of its divisors is an integer number (1824270).

Almost surely, 2^18138108 is an apocalyptic number.

It is an amenable number.

18138108 is an abundant number, since it is smaller than the sum of its proper divisors (25644372).

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

18138108 is a wasteful number, since it uses less digits than its factorization.

18138108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52157 (or 52155 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 30.

The square root of 18138108 is about 4258.8857697759. The cubic root of 18138108 is about 262.7427016115.

The spelling of 18138108 in words is "eighteen million, one hundred thirty-eight thousand, one hundred eight".