18936893 has 2 divisors, whose sum is σ = 18936894. Its totient is φ = 18936892.

The previous prime is 18936829. The next prime is 18936917. The reversal of 18936893 is 39863981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14455204 + 4481689 = 3802^2 + 2117^2 .

It is an emirp because it is prime and its reverse (39863981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18936893 - 2⁶ = 18936829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18936803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9468446 + 9468447.

It is an arithmetic number, because the mean of its divisors is an integer number (9468447).

Almost surely, 2^18936893 is an apocalyptic number.

It is an amenable number.

18936893 is a deficient number, since it is larger than the sum of its proper divisors (1).

18936893 is an equidigital number, since it uses as much as digits as its factorization.

18936893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 47.

The square root of 18936893 is about 4351.6540533457. The cubic root of 18936893 is about 266.5444076716.

The spelling of 18936893 in words is "eighteen million, nine hundred thirty-six thousand, eight hundred ninety-three".