18861444 has 96 divisors (see below), whose sum is σ = 56940800. Its totient is φ = 5287680.

The previous prime is 18861439. The next prime is 18861457. The reversal of 18861444 is 44416881.

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 = 18861399 and 18861408.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45912 + ... + 46320.

Almost surely, 2^18861444 is an apocalyptic number.

18861444 is a gapful number since it is divisible by the number (14) 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 18861444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28470400).

18861444 is an abundant number, since it is smaller than the sum of its proper divisors (38079356).

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

18861444 is a wasteful number, since it uses less digits than its factorization.

18861444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490 (or 482 counting only the distinct ones).

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

The square root of 18861444 is about 4342.9763987385. The cubic root of 18861444 is about 266.1899447966.

The spelling of 18861444 in words is "eighteen million, eight hundred sixty-one thousand, four hundred forty-four".