18261444 has 24 divisors (see below), whose sum is σ = 43333920. Its totient is φ = 5983744.

The previous prime is 18261437. The next prime is 18261479. The reversal of 18261444 is 44416281.

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 7 ways as a sum of consecutive naturals, for example, 12189 + ... + 13604.

It is an arithmetic number, because the mean of its divisors is an integer number (1805580).

Almost surely, 2^18261444 is an apocalyptic number.

It is an amenable number.

18261444 is an abundant number, since it is smaller than the sum of its proper divisors (25072476).

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

18261444 is a wasteful number, since it uses less digits than its factorization.

18261444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25859 (or 25857 counting only the distinct ones).

The product of its digits is 6144, while the sum is 30.

The square root of 18261444 is about 4273.3410816362. The cubic root of 18261444 is about 263.3368918318.

The spelling of 18261444 in words is "eighteen million, two hundred sixty-one thousand, four hundred forty-four".