26405861 has 2 divisors, whose sum is σ = 26405862. Its totient is φ = 26405860.

The previous prime is 26405857. The next prime is 26405867. The reversal of 26405861 is 16850462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26368225 + 37636 = 5135^2 + 194^2 .

It is a cyclic number.

It is not a de Polignac number, because 26405861 - 2² = 26405857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26405867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13202930 + 13202931.

It is an arithmetic number, because the mean of its divisors is an integer number (13202931).

Almost surely, 2^26405861 is an apocalyptic number.

It is an amenable number.

26405861 is a deficient number, since it is larger than the sum of its proper divisors (1).

26405861 is an equidigital number, since it uses as much as digits as its factorization.

26405861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 26405861 is about 5138.6633476031. The cubic root of 26405861 is about 297.7831440344.

The spelling of 26405861 in words is "twenty-six million, four hundred five thousand, eight hundred sixty-one".