18121376 has 96 divisors (see below), whose sum is σ = 45158400. Its totient is φ = 7112448.

The previous prime is 18121351. The next prime is 18121387. The reversal of 18121376 is 67312181.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142625 + ... + 142751.

It is an arithmetic number, because the mean of its divisors is an integer number (470400).

Almost surely, 2^18121376 is an apocalyptic number.

18121376 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18121376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22579200).

18121376 is an abundant number, since it is smaller than the sum of its proper divisors (27037024).

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

18121376 is a wasteful number, since it uses less digits than its factorization.

18121376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171 (or 149 counting only the distinct ones).

The product of its digits is 2016, while the sum is 29.

The square root of 18121376 is about 4256.9209529894. The cubic root of 18121376 is about 262.6618853290.

The spelling of 18121376 in words is "eighteen million, one hundred twenty-one thousand, three hundred seventy-six".