18481376 has 48 divisors (see below), whose sum is σ = 38782800. Its totient is φ = 8644608.

The previous prime is 18481369. The next prime is 18481391. The reversal of 18481376 is 67318481.

It is a super-2 number, since 2×18481376² = 683122517706752, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 68570 + ... + 68838.

It is an arithmetic number, because the mean of its divisors is an integer number (807975).

Almost surely, 2^18481376 is an apocalyptic number.

18481376 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 18481376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19391400).

18481376 is an abundant number, since it is smaller than the sum of its proper divisors (20301424).

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

18481376 is a wasteful number, since it uses less digits than its factorization.

18481376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411 (or 403 counting only the distinct ones).

The product of its digits is 32256, while the sum is 38.

The square root of 18481376 is about 4298.9970923461. The cubic root of 18481376 is about 264.3898433879.

The spelling of 18481376 in words is "eighteen million, four hundred eighty-one thousand, three hundred seventy-six".