18380844 has 30 divisors (see below), whose sum is σ = 48052004. Its totient is φ = 6126840.

The previous prime is 18380827. The next prime is 18380849. The reversal of 18380844 is 44808381.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18380799 and 18380808.

It is not an unprimeable number, because it can be changed into a prime (18380849) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 28042 + ... + 28689.

Almost surely, 2^18380844 is an apocalyptic number.

It is an amenable number.

18380844 is an abundant number, since it is smaller than the sum of its proper divisors (29671160).

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

18380844 is a wasteful number, since it uses less digits than its factorization.

18380844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56747 (or 56736 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The square root of 18380844 is about 4287.2886536831. The cubic root of 18380844 is about 263.9095764703.

The spelling of 18380844 in words is "eighteen million, three hundred eighty thousand, eight hundred forty-four".