18845357 has 2 divisors, whose sum is σ = 18845358. Its totient is φ = 18845356.

The previous prime is 18845347. The next prime is 18845381. The reversal of 18845357 is 75354881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15768841 + 3076516 = 3971^2 + 1754^2 .

It is a cyclic number.

It is not a de Polignac number, because 18845357 - 2⁴ = 18845341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18845327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9422678 + 9422679.

It is an arithmetic number, because the mean of its divisors is an integer number (9422679).

Almost surely, 2^18845357 is an apocalyptic number.

It is an amenable number.

18845357 is a deficient number, since it is larger than the sum of its proper divisors (1).

18845357 is an equidigital number, since it uses as much as digits as its factorization.

18845357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 134400, while the sum is 41.

The square root of 18845357 is about 4341.1239328082. The cubic root of 18845357 is about 266.1142451196.

The spelling of 18845357 in words is "eighteen million, eight hundred forty-five thousand, three hundred fifty-seven".