18905357 has 2 divisors, whose sum is σ = 18905358. Its totient is φ = 18905356.

The previous prime is 18905353. The next prime is 18905401. The reversal of 18905357 is 75350981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18783556 + 121801 = 4334^2 + 349^2 .

It is a cyclic number.

It is not a de Polignac number, because 18905357 - 2² = 18905353 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 18905357.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18905353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9452678 + 9452679.

It is an arithmetic number, because the mean of its divisors is an integer number (9452679).

Almost surely, 2^18905357 is an apocalyptic number.

It is an amenable number.

18905357 is a deficient number, since it is larger than the sum of its proper divisors (1).

18905357 is an equidigital number, since it uses as much as digits as its factorization.

18905357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 18905357 is about 4348.0290937389. The cubic root of 18905357 is about 266.3963648213.

The spelling of 18905357 in words is "eighteen million, nine hundred five thousand, three hundred fifty-seven".