18249644 has 24 divisors (see below), whose sum is σ = 37121280. Its totient is φ = 7688016.

The previous prime is 18249617. The next prime is 18249659. The reversal of 18249644 is 44694281.

It is a super-2 number, since 2×18249644² = 666099012253472, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 18249598 and 18249607.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3872 + ... + 7175.

It is an arithmetic number, because the mean of its divisors is an integer number (1546720).

Almost surely, 2^18249644 is an apocalyptic number.

18249644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18249644 is an abundant number, since it is smaller than the sum of its proper divisors (18871636).

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

18249644 is a wasteful number, since it uses less digits than its factorization.

18249644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11117 (or 11115 counting only the distinct ones).

The product of its digits is 55296, while the sum is 38.

The square root of 18249644 is about 4271.9602058072. The cubic root of 18249644 is about 263.2801594642.

The spelling of 18249644 in words is "eighteen million, two hundred forty-nine thousand, six hundred forty-four".