18249540 has 48 divisors (see below), whose sum is σ = 51612288. Its totient is φ = 4817664.

The previous prime is 18249529. The next prime is 18249563. The reversal of 18249540 is 4594281.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4704 + ... + 7656.

It is an arithmetic number, because the mean of its divisors is an integer number (1075256).

Almost surely, 2^18249540 is an apocalyptic number.

18249540 is a gapful number since it is divisible by the number (10) 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 18249540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25806144).

18249540 is an abundant number, since it is smaller than the sum of its proper divisors (33362748).

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

18249540 is a wasteful number, since it uses less digits than its factorization.

18249540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3068 (or 3066 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 18249540 is about 4271.9480333918. The cubic root of 18249540 is about 263.2796593414.

The spelling of 18249540 in words is "eighteen million, two hundred forty-nine thousand, five hundred forty".