18785957 has 2 divisors, whose sum is σ = 18785958. Its totient is φ = 18785956.

The previous prime is 18785953. The next prime is 18785959. The reversal of 18785957 is 75958781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18783556 + 2401 = 4334^2 + 49^2 .

It is a cyclic number.

It is not a de Polignac number, because 18785957 - 2² = 18785953 is a prime.

Together with 18785959, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18785951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9392978 + 9392979.

It is an arithmetic number, because the mean of its divisors is an integer number (9392979).

Almost surely, 2^18785957 is an apocalyptic number.

It is an amenable number.

18785957 is a deficient number, since it is larger than the sum of its proper divisors (1).

18785957 is an equidigital number, since it uses as much as digits as its factorization.

18785957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 705600, while the sum is 50.

The square root of 18785957 is about 4334.2769869956. The cubic root of 18785957 is about 265.8343561399.

The spelling of 18785957 in words is "eighteen million, seven hundred eighty-five thousand, nine hundred fifty-seven".