18941618 has 4 divisors (see below), whose sum is σ = 28412430. Its totient is φ = 9470808.

The previous prime is 18941567. The next prime is 18941623. The reversal of 18941618 is 81614981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81614981 = 7 ⋅11659283.

It can be written as a sum of positive squares in only one way, i.e., 18344089 + 597529 = 4283^2 + 773^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4735403 + ... + 4735406.

Almost surely, 2^18941618 is an apocalyptic number.

18941618 is a deficient number, since it is larger than the sum of its proper divisors (9470812).

18941618 is an equidigital number, since it uses as much as digits as its factorization.

18941618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9470811.

The product of its digits is 13824, while the sum is 38.

The square root of 18941618 is about 4352.1969165009. The cubic root of 18941618 is about 266.5665745884.

The spelling of 18941618 in words is "eighteen million, nine hundred forty-one thousand, six hundred eighteen".