18941357 has 2 divisors, whose sum is σ = 18941358. Its totient is φ = 18941356.

The previous prime is 18941339. The next prime is 18941359. The reversal of 18941357 is 75314981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18913801 + 27556 = 4349^2 + 166^2 .

It is a cyclic number.

It is not a de Polignac number, because 18941357 - 2¹⁰ = 18940333 is a prime.

Together with 18941359, it forms a pair of twin primes.

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 18941357.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18941359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9470678 + 9470679.

It is an arithmetic number, because the mean of its divisors is an integer number (9470679).

Almost surely, 2^18941357 is an apocalyptic number.

It is an amenable number.

18941357 is a deficient number, since it is larger than the sum of its proper divisors (1).

18941357 is an equidigital number, since it uses as much as digits as its factorization.

18941357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 38.

The square root of 18941357 is about 4352.1669315411. The cubic root of 18941357 is about 266.5653502263.

The spelling of 18941357 in words is "eighteen million, nine hundred forty-one thousand, three hundred fifty-seven".