18944460 has 144 divisors (see below), whose sum is σ = 62741952. Its totient is φ = 4608000.

The previous prime is 18944459. The next prime is 18944473. The reversal of 18944460 is 6444981.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 125385 + ... + 125535.

It is an arithmetic number, because the mean of its divisors is an integer number (435708).

Almost surely, 2^18944460 is an apocalyptic number.

18944460 is a gapful number since it is divisible by the number (10) 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 18944460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31370976).

18944460 is an abundant number, since it is smaller than the sum of its proper divisors (43797492).

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

18944460 is a wasteful number, since it uses less digits than its factorization.

18944460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 18944460 is about 4352.5234060255. The cubic root of 18944460 is about 266.5799058029.

The spelling of 18944460 in words is "eighteen million, nine hundred forty-four thousand, four hundred sixty".