18641018 has 12 divisors (see below), whose sum is σ = 30734970. Its totient is φ = 8473080.

The previous prime is 18641011. The next prime is 18641039. The reversal of 18641018 is 81014681.

It can be written as a sum of positive squares in only one way, i.e., 12623809 + 6017209 = 3553^2 + 2453^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18641011) 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, 38273 + ... + 38756.

Almost surely, 2^18641018 is an apocalyptic number.

18641018 is a deficient number, since it is larger than the sum of its proper divisors (12093952).

18641018 is a wasteful number, since it uses less digits than its factorization.

18641018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77053 (or 77042 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 18641018 is about 4317.5245222234. The cubic root of 18641018 is about 265.1489277988.

Adding to 18641018 its reverse (81014681), we get a palindrome (99655699).

It can be divided in two parts, 1864 and 1018, that added together give a palindrome (2882).

The spelling of 18641018 in words is "eighteen million, six hundred forty-one thousand, eighteen".