18026891 has 2 divisors, whose sum is σ = 18026892. Its totient is φ = 18026890.

The previous prime is 18026887. The next prime is 18026909. The reversal of 18026891 is 19862081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18026891 - 2² = 18026887 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18026821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9013445 + 9013446.

It is an arithmetic number, because the mean of its divisors is an integer number (9013446).

Almost surely, 2^18026891 is an apocalyptic number.

18026891 is a deficient number, since it is larger than the sum of its proper divisors (1).

18026891 is an equidigital number, since it uses as much as digits as its factorization.

18026891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 18026891 is about 4245.8086391169. The cubic root of 18026891 is about 262.2045825524.

The spelling of 18026891 in words is "eighteen million, twenty-six thousand, eight hundred ninety-one".