18122438 has 8 divisors (see below), whose sum is σ = 27447888. Its totient is φ = 8973144.

The previous prime is 18122437. The next prime is 18122441. The reversal of 18122438 is 83422181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18122438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18122431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43781 + ... + 44192.

It is an arithmetic number, because the mean of its divisors is an integer number (3430986).

Almost surely, 2^18122438 is an apocalyptic number.

18122438 is a deficient number, since it is larger than the sum of its proper divisors (9325450).

18122438 is a wasteful number, since it uses less digits than its factorization.

18122438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88078.

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

The square root of 18122438 is about 4257.0456892075. The cubic root of 18122438 is about 262.6670163130.

The spelling of 18122438 in words is "eighteen million, one hundred twenty-two thousand, four hundred thirty-eight".