18267812 has 18 divisors (see below), whose sum is σ = 32450418. Its totient is φ = 8998272.

The previous prime is 18267811. The next prime is 18267827. The reversal of 18267812 is 21876281.

It can be written as a sum of positive squares in 3 ways, for example, as 7873636 + 10394176 = 2806^2 + 3224^2 .

It is not an unprimeable number, because it can be changed into a prime (18267811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20888 + ... + 21744.

It is an arithmetic number, because the mean of its divisors is an integer number (1802801).

Almost surely, 2^18267812 is an apocalyptic number.

It is an amenable number.

18267812 is a deficient number, since it is larger than the sum of its proper divisors (14182606).

18267812 is an equidigital number, since it uses as much as digits as its factorization.

18267812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007 (or 932 counting only the distinct ones).

The product of its digits is 10752, while the sum is 35.

The square root of 18267812 is about 4274.0861011449. The cubic root of 18267812 is about 263.3674979263.

The spelling of 18267812 in words is "eighteen million, two hundred sixty-seven thousand, eight hundred twelve".