18912793 has 2 divisors, whose sum is σ = 18912794. Its totient is φ = 18912792.

The previous prime is 18912781. The next prime is 18912797. The reversal of 18912793 is 39721981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18896409 + 16384 = 4347^2 + 128^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18912793 is a prime.

It is not a weakly prime, because it can be changed into another prime (18912797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9456396 + 9456397.

It is an arithmetic number, because the mean of its divisors is an integer number (9456397).

Almost surely, 2^18912793 is an apocalyptic number.

It is an amenable number.

18912793 is a deficient number, since it is larger than the sum of its proper divisors (1).

18912793 is an equidigital number, since it uses as much as digits as its factorization.

18912793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 40.

The square root of 18912793 is about 4348.8841097459. The cubic root of 18912793 is about 266.4312872634.

The spelling of 18912793 in words is "eighteen million, nine hundred twelve thousand, seven hundred ninety-three".