18422393 has 4 divisors (see below), whose sum is σ = 20097168. Its totient is φ = 16747620.

The previous prime is 18422389. The next prime is 18422479. The reversal of 18422393 is 39322481.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39322481 = 11 ⋅3574771.

It is a cyclic number.

It is not a de Polignac number, because 18422393 - 2² = 18422389 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18422303) 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, 837371 + ... + 837392.

It is an arithmetic number, because the mean of its divisors is an integer number (5024292).

Almost surely, 2^18422393 is an apocalyptic number.

It is an amenable number.

18422393 is a deficient number, since it is larger than the sum of its proper divisors (1674775).

18422393 is a wasteful number, since it uses less digits than its factorization.

18422393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1674774.

The product of its digits is 10368, while the sum is 32.

The square root of 18422393 is about 4292.1315217500. The cubic root of 18422393 is about 264.1082783955.

The spelling of 18422393 in words is "eighteen million, four hundred twenty-two thousand, three hundred ninety-three".