18481618 has 16 divisors (see below), whose sum is σ = 29434104. Its totient is φ = 8673280.

The previous prime is 18481583. The next prime is 18481621. The reversal of 18481618 is 81618481.

It can be written as a sum of positive squares in 4 ways, for example, as 10284849 + 8196769 = 3207^2 + 2863^2 .

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, 20538 + ... + 21418.

Almost surely, 2^18481618 is an apocalyptic number.

18481618 is a deficient number, since it is larger than the sum of its proper divisors (10952486).

18481618 is a wasteful number, since it uses less digits than its factorization.

18481618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517.

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

The square root of 18481618 is about 4299.0252383535. The cubic root of 18481618 is about 264.3909973796.

It can be divided in two parts, 18 and 481618, that added together give a square (481636 = 694²).

The spelling of 18481618 in words is "eighteen million, four hundred eighty-one thousand, six hundred eighteen".