18245993 has 2 divisors, whose sum is σ = 18245994. Its totient is φ = 18245992.

The previous prime is 18245987. The next prime is 18245999. The reversal of 18245993 is 39954281.

It is a balanced prime because it is at equal distance from previous prime (18245987) and next prime (18245999).

It can be written as a sum of positive squares in only one way, i.e., 10163344 + 8082649 = 3188^2 + 2843^2 .

It is a cyclic number.

It is not a de Polignac number, because 18245993 - 2¹⁰ = 18244969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18245993.

It is not a weakly prime, because it can be changed into another prime (18245999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9122996 + 9122997.

It is an arithmetic number, because the mean of its divisors is an integer number (9122997).

Almost surely, 2^18245993 is an apocalyptic number.

It is an amenable number.

18245993 is a deficient number, since it is larger than the sum of its proper divisors (1).

18245993 is an equidigital number, since it uses as much as digits as its factorization.

18245993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 41.

The square root of 18245993 is about 4271.5328630364. The cubic root of 18245993 is about 263.2626011313.

The spelling of 18245993 in words is "eighteen million, two hundred forty-five thousand, nine hundred ninety-three".