18244040 has 32 divisors (see below), whose sum is σ = 42007680. Its totient is φ = 7127232.

The previous prime is 18244019. The next prime is 18244049. The reversal of 18244040 is 4044281.

It is a junction number, because it is equal to n+sod(n) for n = 18243997 and 18244015.

It is not an unprimeable number, because it can be changed into a prime (18244049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3584 + ... + 7023.

It is an arithmetic number, because the mean of its divisors is an integer number (1312740).

Almost surely, 2^18244040 is an apocalyptic number.

18244040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18244040 is an abundant number, since it is smaller than the sum of its proper divisors (23763640).

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

18244040 is a wasteful number, since it uses less digits than its factorization.

18244040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10661 (or 10657 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 18244040 is about 4271.3042504603. The cubic root of 18244040 is about 263.2532078323.

The spelling of 18244040 in words is "eighteen million, two hundred forty-four thousand, forty".