18442431 has 16 divisors (see below), whose sum is σ = 31225600. Its totient is φ = 10538424.

The previous prime is 18442421. The next prime is 18442441. The reversal of 18442431 is 13424481.

It is an interprime number because it is at equal distance from previous prime (18442421) and next prime (18442441).

It is not a de Polignac number, because 18442431 - 2⁶ = 18442367 is a prime.

It is a super-2 number, since 2×18442431² = 680246522379522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 18442395 and 18442404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18442421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48601 + ... + 48978.

It is an arithmetic number, because the mean of its divisors is an integer number (1951600).

Almost surely, 2^18442431 is an apocalyptic number.

18442431 is a deficient number, since it is larger than the sum of its proper divisors (12783169).

18442431 is an equidigital number, since it uses as much as digits as its factorization.

18442431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97595 (or 97589 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 18442431 is about 4294.4651587829. The cubic root of 18442431 is about 264.2040003803.

The spelling of 18442431 in words is "eighteen million, four hundred forty-two thousand, four hundred thirty-one".