18726493 has 2 divisors, whose sum is σ = 18726494. Its totient is φ = 18726492.

The previous prime is 18726481. The next prime is 18726523. The reversal of 18726493 is 39462781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14577124 + 4149369 = 3818^2 + 2037^2 .

It is an emirp because it is prime and its reverse (39462781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18726493 - 2⁹ = 18725981 is a prime.

It is a nialpdrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18726413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9363246 + 9363247.

It is an arithmetic number, because the mean of its divisors is an integer number (9363247).

Almost surely, 2^18726493 is an apocalyptic number.

It is an amenable number.

18726493 is a deficient number, since it is larger than the sum of its proper divisors (1).

18726493 is an equidigital number, since it uses as much as digits as its factorization.

18726493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 40.

The square root of 18726493 is about 4327.4118130818. The cubic root of 18726493 is about 265.5535740227.

The spelling of 18726493 in words is "eighteen million, seven hundred twenty-six thousand, four hundred ninety-three".