18618443 has 2 divisors, whose sum is σ = 18618444. Its totient is φ = 18618442.

The previous prime is 18618409. The next prime is 18618463. The reversal of 18618443 is 34481681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18618443 - 2¹² = 18614347 is a prime.

It is not a weakly prime, because it can be changed into another prime (18618463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9309221 + 9309222.

It is an arithmetic number, because the mean of its divisors is an integer number (9309222).

Almost surely, 2^18618443 is an apocalyptic number.

18618443 is a deficient number, since it is larger than the sum of its proper divisors (1).

18618443 is an equidigital number, since it uses as much as digits as its factorization.

18618443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 35.

The square root of 18618443 is about 4314.9093849118. The cubic root of 18618443 is about 265.0418493300.

The spelling of 18618443 in words is "eighteen million, six hundred eighteen thousand, four hundred forty-three".