18227018 has 16 divisors (see below), whose sum is σ = 27991656. Its totient is φ = 8898240.

The previous prime is 18227003. The next prime is 18227081. The reversal of 18227018 is 81072281.

It can be written as a sum of positive squares in 4 ways, for example, as 16104169 + 2122849 = 4013^2 + 1457^2 .

It is a Curzon 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, 39308 + ... + 39768.

Almost surely, 2^18227018 is an apocalyptic number.

18227018 is a deficient number, since it is larger than the sum of its proper divisors (9764638).

18227018 is a wasteful number, since it uses less digits than its factorization.

18227018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 18227018 is about 4269.3111856598. The cubic root of 18227018 is about 263.1713091141.

Adding to 18227018 its reverse (81072281), we get a palindrome (99299299).

The spelling of 18227018 in words is "eighteen million, two hundred twenty-seven thousand, eighteen".