18238849 has 2 divisors, whose sum is σ = 18238850. Its totient is φ = 18238848.

The previous prime is 18238811. The next prime is 18238853. The reversal of 18238849 is 94883281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17098225 + 1140624 = 4135^2 + 1068^2 .

It is a cyclic number.

It is not a de Polignac number, because 18238849 - 2¹³ = 18230657 is a prime.

It is a super-2 number, since 2×18238849² = 665311225689602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18238889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9119424 + 9119425.

It is an arithmetic number, because the mean of its divisors is an integer number (9119425).

Almost surely, 2^18238849 is an apocalyptic number.

It is an amenable number.

18238849 is a deficient number, since it is larger than the sum of its proper divisors (1).

18238849 is an equidigital number, since it uses as much as digits as its factorization.

18238849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 43.

The square root of 18238849 is about 4270.6965474030. The cubic root of 18238849 is about 263.2282375401.

The spelling of 18238849 in words is "eighteen million, two hundred thirty-eight thousand, eight hundred forty-nine".