18442237 has 8 divisors (see below), whose sum is σ = 20158272. Its totient is φ = 16732800.

The previous prime is 18442223. The next prime is 18442247. The reversal of 18442237 is 73224481.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18442237 is a prime.

It is a super-2 number, since 2×18442237² = 680232211128338, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18442199 and 18442208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18442247) 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, 5613 + ... + 8269.

It is an arithmetic number, because the mean of its divisors is an integer number (2519784).

Almost surely, 2^18442237 is an apocalyptic number.

It is an amenable number.

18442237 is a deficient number, since it is larger than the sum of its proper divisors (1716035).

18442237 is a wasteful number, since it uses less digits than its factorization.

18442237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3299.

The product of its digits is 10752, while the sum is 31.

The square root of 18442237 is about 4294.4425715103. The cubic root of 18442237 is about 264.2030739703.

The spelling of 18442237 in words is "eighteen million, four hundred forty-two thousand, two hundred thirty-seven".