18249720 has 32 divisors (see below), whose sum is σ = 54749520. Its totient is φ = 4866560.

The previous prime is 18249719. The next prime is 18249739. The reversal of 18249720 is 2794281.

It is a happy number.

It is a congruent number.

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, 75921 + ... + 76160.

Almost surely, 2^18249720 is an apocalyptic number.

18249720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18249720 is an abundant number, since it is smaller than the sum of its proper divisors (36499800).

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

18249720 is a wasteful number, since it uses less digits than its factorization.

18249720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152095 (or 152091 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 18249720 is about 4271.9691010119. The cubic root of 18249720 is about 263.2805249373.

The spelling of 18249720 in words is "eighteen million, two hundred forty-nine thousand, seven hundred twenty".