26191993 has 4 divisors (see below), whose sum is σ = 27036928. Its totient is φ = 25347060.

The previous prime is 26191969. The next prime is 26191999. The reversal of 26191993 is 39919162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26191993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26191999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 422421 + ... + 422482.

It is an arithmetic number, because the mean of its divisors is an integer number (6759232).

Almost surely, 2^26191993 is an apocalyptic number.

It is an amenable number.

26191993 is a deficient number, since it is larger than the sum of its proper divisors (844935).

26191993 is an equidigital number, since it uses as much as digits as its factorization.

26191993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844934.

The product of its digits is 26244, while the sum is 40.

The square root of 26191993 is about 5117.8113486138. The cubic root of 26191993 is about 296.9770224867.

The spelling of 26191993 in words is "twenty-six million, one hundred ninety-one thousand, nine hundred ninety-three".