18941018 has 8 divisors (see below), whose sum is σ = 28800948. Its totient is φ = 9340704.

The previous prime is 18941017. The next prime is 18941023. The reversal of 18941018 is 81014981.

It can be written as a sum of positive squares in 2 ways, for example, as 18722929 + 218089 = 4327^2 + 467^2 .

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

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18941011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64721 + ... + 65012.

Almost surely, 2^18941018 is an apocalyptic number.

18941018 is a deficient number, since it is larger than the sum of its proper divisors (9859930).

18941018 is a wasteful number, since it uses less digits than its factorization.

18941018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129808.

The product of its (nonzero) digits is 2304, while the sum is 32.

The square root of 18941018 is about 4352.1279852504. The cubic root of 18941018 is about 266.5637599462.

Adding to 18941018 its reverse (81014981), we get a palindrome (99955999).

The spelling of 18941018 in words is "eighteen million, nine hundred forty-one thousand, eighteen".