18844140 has 48 divisors (see below), whose sum is σ = 60302592. Its totient is φ = 4307136.

The previous prime is 18844129. The next prime is 18844151. The reversal of 18844140 is 4144881.

It is an interprime number because it is at equal distance from previous prime (18844129) and next prime (18844151).

It is a super-2 number, since 2×18844140² = 710203224679200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 18844098 and 18844107.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22014 + ... + 22853.

It is an arithmetic number, because the mean of its divisors is an integer number (1256304).

Almost surely, 2^18844140 is an apocalyptic number.

18844140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18844140 is an abundant number, since it is smaller than the sum of its proper divisors (41458452).

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

18844140 is a wasteful number, since it uses less digits than its factorization.

18844140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44886 (or 44884 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 30.

The square root of 18844140 is about 4340.9837594720. The cubic root of 18844140 is about 266.1085165997.

The spelling of 18844140 in words is "eighteen million, eight hundred forty-four thousand, one hundred forty".