18442131 has 4 divisors (see below), whose sum is σ = 24589512. Its totient is φ = 12294752.

The previous prime is 18442129. The next prime is 18442139. The reversal of 18442131 is 13124481.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18442131 - 2¹ = 18442129 is a prime.

It is a super-2 number, since 2×18442131² = 680224391642322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18442139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3073686 + ... + 3073691.

It is an arithmetic number, because the mean of its divisors is an integer number (6147378).

Almost surely, 2^18442131 is an apocalyptic number.

18442131 is a deficient number, since it is larger than the sum of its proper divisors (6147381).

18442131 is an equidigital number, since it uses as much as digits as its factorization.

18442131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6147380.

The product of its digits is 768, while the sum is 24.

The square root of 18442131 is about 4294.4302299607. The cubic root of 18442131 is about 264.2025677848.

The spelling of 18442131 in words is "eighteen million, four hundred forty-two thousand, one hundred thirty-one".