18422239 has 8 divisors (see below), whose sum is σ = 20256768. Its totient is φ = 16614360.

The previous prime is 18422231. The next prime is 18422249. The reversal of 18422239 is 93222481.

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

It is a cyclic number.

It is not a de Polignac number, because 18422239 - 2³ = 18422231 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18422239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18422231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5197 + ... + 7990.

It is an arithmetic number, because the mean of its divisors is an integer number (2532096).

Almost surely, 2^18422239 is an apocalyptic number.

18422239 is a deficient number, since it is larger than the sum of its proper divisors (1834529).

18422239 is a wasteful number, since it uses less digits than its factorization.

18422239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13325.

The product of its digits is 6912, while the sum is 31.

The square root of 18422239 is about 4292.1135819081. The cubic root of 18422239 is about 264.1075424652.

The spelling of 18422239 in words is "eighteen million, four hundred twenty-two thousand, two hundred thirty-nine".