26405993 has 2 divisors, whose sum is σ = 26405994. Its totient is φ = 26405992.

The previous prime is 26405971. The next prime is 26406041. The reversal of 26405993 is 39950462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23931664 + 2474329 = 4892^2 + 1573^2 .

It is a cyclic number.

It is not a de Polignac number, because 26405993 - 2²⁰ = 25357417 is a prime.

It is not a weakly prime, because it can be changed into another prime (26405903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13202996 + 13202997.

It is an arithmetic number, because the mean of its divisors is an integer number (13202997).

Almost surely, 2^26405993 is an apocalyptic number.

It is an amenable number.

26405993 is a deficient number, since it is larger than the sum of its proper divisors (1).

26405993 is an equidigital number, since it uses as much as digits as its factorization.

26405993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 26405993 is about 5138.6761913940. The cubic root of 26405993 is about 297.7836402287.

The spelling of 26405993 in words is "twenty-six million, four hundred five thousand, nine hundred ninety-three".