18787253 has 2 divisors, whose sum is σ = 18787254. Its totient is φ = 18787252.

The previous prime is 18787213. The next prime is 18787283. The reversal of 18787253 is 35278781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18645124 + 142129 = 4318^2 + 377^2 .

It is a cyclic number.

It is not a de Polignac number, because 18787253 - 2⁸ = 18786997 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18787253.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18787213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9393626 + 9393627.

It is an arithmetic number, because the mean of its divisors is an integer number (9393627).

Almost surely, 2^18787253 is an apocalyptic number.

It is an amenable number.

18787253 is a deficient number, since it is larger than the sum of its proper divisors (1).

18787253 is an equidigital number, since it uses as much as digits as its factorization.

18787253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94080, while the sum is 41.

The square root of 18787253 is about 4334.4264903214. The cubic root of 18787253 is about 265.8404690998.

The spelling of 18787253 in words is "eighteen million, seven hundred eighty-seven thousand, two hundred fifty-three".