18218075 has 6 divisors (see below), whose sum is σ = 22590444. Its totient is φ = 14574440.

The previous prime is 18218071. The next prime is 18218089. The reversal of 18218075 is 57081281.

It is a happy number.

It is not a de Polignac number, because 18218075 - 2² = 18218071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18218071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 364337 + ... + 364386.

It is an arithmetic number, because the mean of its divisors is an integer number (3765074).

Almost surely, 2^18218075 is an apocalyptic number.

18218075 is a deficient number, since it is larger than the sum of its proper divisors (4372369).

18218075 is an equidigital number, since it uses as much as digits as its factorization.

18218075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728733 (or 728728 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 18218075 is about 4268.2636985079. The cubic root of 18218075 is about 263.1282608210.

The spelling of 18218075 in words is "eighteen million, two hundred eighteen thousand, seventy-five".