18812093 has 2 divisors, whose sum is σ = 18812094. Its totient is φ = 18812092.

The previous prime is 18812077. The next prime is 18812117. The reversal of 18812093 is 39021881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16337764 + 2474329 = 4042^2 + 1573^2 .

It is an emirp because it is prime and its reverse (39021881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18812093 - 2⁴ = 18812077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18812063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9406046 + 9406047.

It is an arithmetic number, because the mean of its divisors is an integer number (9406047).

Almost surely, 2^18812093 is an apocalyptic number.

It is an amenable number.

18812093 is a deficient number, since it is larger than the sum of its proper divisors (1).

18812093 is an equidigital number, since it uses as much as digits as its factorization.

18812093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 18812093 is about 4337.2909747906. The cubic root of 18812093 is about 265.9575798712.

The spelling of 18812093 in words is "eighteen million, eight hundred twelve thousand, ninety-three".