18938224 has 20 divisors (see below), whose sum is σ = 36767736. Its totient is φ = 9449792.

The previous prime is 18938209. The next prime is 18938239. The reversal of 18938224 is 42283981.

It is an interprime number because it is at equal distance from previous prime (18938209) and next prime (18938239).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10062 + ... + 11794.

Almost surely, 2^18938224 is an apocalyptic number.

It is an amenable number.

18938224 is a deficient number, since it is larger than the sum of its proper divisors (17829512).

18938224 is a wasteful number, since it uses less digits than its factorization.

18938224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2424 (or 2418 counting only the distinct ones).

The product of its digits is 27648, while the sum is 37.

The square root of 18938224 is about 4351.8069810137. The cubic root of 18938224 is about 266.5506523126.

The spelling of 18938224 in words is "eighteen million, nine hundred thirty-eight thousand, two hundred twenty-four".