18393241 has 2 divisors, whose sum is σ = 18393242. Its totient is φ = 18393240.

The previous prime is 18393229. The next prime is 18393251. The reversal of 18393241 is 14239381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15768841 + 2624400 = 3971^2 + 1620^2 .

It is a cyclic number.

It is not a de Polignac number, because 18393241 - 2⁷ = 18393113 is a prime.

It is a super-2 number, since 2×18393241² = 676622628968162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18393251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9196620 + 9196621.

It is an arithmetic number, because the mean of its divisors is an integer number (9196621).

Almost surely, 2^18393241 is an apocalyptic number.

It is an amenable number.

18393241 is a deficient number, since it is larger than the sum of its proper divisors (1).

18393241 is an equidigital number, since it uses as much as digits as its factorization.

18393241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 31.

The square root of 18393241 is about 4288.7341955407. The cubic root of 18393241 is about 263.9688945981.

The spelling of 18393241 in words is "eighteen million, three hundred ninety-three thousand, two hundred forty-one".