18147444 has 48 divisors (see below), whose sum is σ = 49392000. Its totient is φ = 5183808.

The previous prime is 18147421. The next prime is 18147457. The reversal of 18147444 is 44474181.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1912 + ... + 6320.

It is an arithmetic number, because the mean of its divisors is an integer number (1029000).

Almost surely, 2^18147444 is an apocalyptic number.

18147444 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 18147444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24696000).

18147444 is an abundant number, since it is smaller than the sum of its proper divisors (31244556).

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

18147444 is a wasteful number, since it uses less digits than its factorization.

18147444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4437 (or 4421 counting only the distinct ones).

The product of its digits is 14336, while the sum is 33.

The square root of 18147444 is about 4259.9816901015. The cubic root of 18147444 is about 262.7877732937.

The spelling of 18147444 in words is "eighteen million, one hundred forty-seven thousand, four hundred forty-four".