18288493 has 2 divisors, whose sum is σ = 18288494. Its totient is φ = 18288492.

The previous prime is 18288467. The next prime is 18288509. The reversal of 18288493 is 39488281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11303044 + 6985449 = 3362^2 + 2643^2 .

It is a cyclic number.

It is not a de Polignac number, because 18288493 - 2¹⁷ = 18157421 is a prime.

It is a super-2 number, since 2×18288493² = 668937952422098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18288443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9144246 + 9144247.

It is an arithmetic number, because the mean of its divisors is an integer number (9144247).

Almost surely, 2^18288493 is an apocalyptic number.

It is an amenable number.

18288493 is a deficient number, since it is larger than the sum of its proper divisors (1).

18288493 is an equidigital number, since it uses as much as digits as its factorization.

18288493 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 18288493 is about 4276.5047644075. The cubic root of 18288493 is about 263.4668466078.

It can be divided in two parts, 18288 and 493, that added together give a palindrome (18781).

The spelling of 18288493 in words is "eighteen million, two hundred eighty-eight thousand, four hundred ninety-three".