18842231 has 2 divisors, whose sum is σ = 18842232. Its totient is φ = 18842230.

The previous prime is 18842191. The next prime is 18842237. The reversal of 18842231 is 13224881.

It is a strong prime.

It is an emirp because it is prime and its reverse (13224881) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18842231 is a prime.

It is a super-2 number, since 2×18842231² = 710059338114722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18842194 and 18842203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18842237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9421115 + 9421116.

It is an arithmetic number, because the mean of its divisors is an integer number (9421116).

Almost surely, 2^18842231 is an apocalyptic number.

18842231 is a deficient number, since it is larger than the sum of its proper divisors (1).

18842231 is an equidigital number, since it uses as much as digits as its factorization.

18842231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3072, while the sum is 29.

The square root of 18842231 is about 4340.7638728685. The cubic root of 18842231 is about 266.0995302816.

The spelling of 18842231 in words is "eighteen million, eight hundred forty-two thousand, two hundred thirty-one".