18438212 has 12 divisors (see below), whose sum is σ = 34749036. Its totient is φ = 8509920.

The previous prime is 18438193. The next prime is 18438221. The reversal of 18438212 is 21283481.

It can be written as a sum of positive squares in 2 ways, for example, as 7054336 + 11383876 = 2656^2 + 3374^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177239 + ... + 177342.

It is an arithmetic number, because the mean of its divisors is an integer number (2895753).

Almost surely, 2^18438212 is an apocalyptic number.

It is an amenable number.

18438212 is a deficient number, since it is larger than the sum of its proper divisors (16310824).

18438212 is a wasteful number, since it uses less digits than its factorization.

18438212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354598 (or 354596 counting only the distinct ones).

The product of its digits is 3072, while the sum is 29.

The square root of 18438212 is about 4293.9739170144. The cubic root of 18438212 is about 264.1838518853.

The spelling of 18438212 in words is "eighteen million, four hundred thirty-eight thousand, two hundred twelve".