18481865 has 8 divisors (see below), whose sum is σ = 22214088. Its totient is φ = 14761600.

The previous prime is 18481861. The next prime is 18481867. The reversal of 18481865 is 56818481.

It can be written as a sum of positive squares in 4 ways, for example, as 4583881 + 13897984 = 2141^2 + 3728^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18481865 - 2² = 18481861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18481861) 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, 869 + ... + 6141.

It is an arithmetic number, because the mean of its divisors is an integer number (2776761).

Almost surely, 2^18481865 is an apocalyptic number.

It is an amenable number.

18481865 is a deficient number, since it is larger than the sum of its proper divisors (3732223).

18481865 is an equidigital number, since it uses as much as digits as its factorization.

18481865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5979.

The product of its digits is 61440, while the sum is 41.

The square root of 18481865 is about 4299.0539656999. The cubic root of 18481865 is about 264.3921752037.

The spelling of 18481865 in words is "eighteen million, four hundred eighty-one thousand, eight hundred sixty-five".