18714257 has 2 divisors, whose sum is σ = 18714258. Its totient is φ = 18714256.

The previous prime is 18714253. The next prime is 18714281. The reversal of 18714257 is 75241781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14868736 + 3845521 = 3856^2 + 1961^2 .

It is a cyclic number.

It is not a de Polignac number, because 18714257 - 2² = 18714253 is a prime.

It is equal to p_1193975 and since 18714257 and 1193975 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (18714253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9357128 + 9357129.

It is an arithmetic number, because the mean of its divisors is an integer number (9357129).

Almost surely, 2^18714257 is an apocalyptic number.

It is an amenable number.

18714257 is a deficient number, since it is larger than the sum of its proper divisors (1).

18714257 is an equidigital number, since it uses as much as digits as its factorization.

18714257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15680, while the sum is 35.

The square root of 18714257 is about 4325.9978039754. The cubic root of 18714257 is about 265.4957233349.

The spelling of 18714257 in words is "eighteen million, seven hundred fourteen thousand, two hundred fifty-seven".