18244538 has 16 divisors (see below), whose sum is σ = 30489480. Its totient is φ = 8129856.

The previous prime is 18244531. The next prime is 18244559. The reversal of 18244538 is 83544281.

It can be written as a sum of positive squares in 4 ways, for example, as 10387729 + 7856809 = 3223^2 + 2803^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18244498 and 18244507.

It is not an unprimeable number, because it can be changed into a prime (18244531) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 11345 + ... + 12852.

Almost surely, 2^18244538 is an apocalyptic number.

18244538 is a deficient number, since it is larger than the sum of its proper divisors (12244942).

18244538 is a wasteful number, since it uses less digits than its factorization.

18244538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24241.

The product of its digits is 30720, while the sum is 35.

The square root of 18244538 is about 4271.3625460736. The cubic root of 18244538 is about 263.2556031151.

The spelling of 18244538 in words is "eighteen million, two hundred forty-four thousand, five hundred thirty-eight".