18442331 has 8 divisors (see below), whose sum is σ = 20555280. Its totient is φ = 16443648.

The previous prime is 18442247. The next prime is 18442337. The reversal of 18442331 is 13324481.

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 18442331 - 2¹⁰ = 18441307 is a prime.

It is a super-2 number, since 2×18442331² = 680239145427122, which contains 22 as substring.

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 18442331.

It is not an unprimeable number, because it can be changed into a prime (18442337) 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, 28226 + ... + 28871.

It is an arithmetic number, because the mean of its divisors is an integer number (2569410).

Almost surely, 2^18442331 is an apocalyptic number.

18442331 is a deficient number, since it is larger than the sum of its proper divisors (2112949).

18442331 is a wasteful number, since it uses less digits than its factorization.

18442331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57133.

The product of its digits is 2304, while the sum is 26.

The square root of 18442331 is about 4294.4535158737. The cubic root of 18442331 is about 264.2035228502.

The spelling of 18442331 in words is "eighteen million, four hundred forty-two thousand, three hundred thirty-one".