18081824 has 12 divisors (see below), whose sum is σ = 35598654. Its totient is φ = 9040896.

The previous prime is 18081821. The next prime is 18081853. The reversal of 18081824 is 42818081.

It can be written as a sum of positive squares in only one way, i.e., 14592400 + 3489424 = 3820^2 + 1868^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 565057 = 18081824 / (1 + 8 + 0 + 8 + 1 + 8 + 2 + 4).

It is not an unprimeable number, because it can be changed into a prime (18081821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282497 + ... + 282560.

Almost surely, 2^18081824 is an apocalyptic number.

It is an amenable number.

18081824 is a deficient number, since it is larger than the sum of its proper divisors (17516830).

18081824 is an equidigital number, since it uses as much as digits as its factorization.

18081824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565067 (or 565059 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 32.

The square root of 18081824 is about 4252.2728040426. The cubic root of 18081824 is about 262.4706494773.

The spelling of 18081824 in words is "eighteen million, eighty-one thousand, eight hundred twenty-four".