18622238 has 4 divisors (see below), whose sum is σ = 27933360. Its totient is φ = 9311118.

The previous prime is 18622237. The next prime is 18622243. The reversal of 18622238 is 83222681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83222681 = 6959 ⋅11959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18622237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4655558 + ... + 4655561.

It is an arithmetic number, because the mean of its divisors is an integer number (6983340).

Almost surely, 2^18622238 is an apocalyptic number.

18622238 is a deficient number, since it is larger than the sum of its proper divisors (9311122).

18622238 is an equidigital number, since it uses as much as digits as its factorization.

18622238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9311121.

The product of its digits is 9216, while the sum is 32.

The square root of 18622238 is about 4315.3491168155. The cubic root of 18622238 is about 265.0598559464.

The spelling of 18622238 in words is "eighteen million, six hundred twenty-two thousand, two hundred thirty-eight".