18841618 has 4 divisors (see below), whose sum is σ = 28262430. Its totient is φ = 9420808.

The previous prime is 18841609. The next prime is 18841633. The reversal of 18841618 is 81614881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81614881 = 4463 ⋅18287.

It can be written as a sum of positive squares in only one way, i.e., 18037009 + 804609 = 4247^2 + 897^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4710403 + ... + 4710406.

Almost surely, 2^18841618 is an apocalyptic number.

18841618 is a deficient number, since it is larger than the sum of its proper divisors (9420812).

18841618 is an equidigital number, since it uses as much as digits as its factorization.

18841618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9420811.

The product of its digits is 12288, while the sum is 37.

The square root of 18841618 is about 4340.6932626022. The cubic root of 18841618 is about 266.0966445514.

The spelling of 18841618 in words is "eighteen million, eight hundred forty-one thousand, six hundred eighteen".