26290409 has 2 divisors, whose sum is σ = 26290410. Its totient is φ = 26290408.

The previous prime is 26290391. The next prime is 26290421. The reversal of 26290409 is 90409262.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22278400 + 4012009 = 4720^2 + 2003^2 .

It is a cyclic number.

It is not a de Polignac number, because 26290409 - 2¹² = 26286313 is a prime.

It is not a weakly prime, because it can be changed into another prime (26290469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13145204 + 13145205.

It is an arithmetic number, because the mean of its divisors is an integer number (13145205).

Almost surely, 2^26290409 is an apocalyptic number.

It is an amenable number.

26290409 is a deficient number, since it is larger than the sum of its proper divisors (1).

26290409 is an equidigital number, since it uses as much as digits as its factorization.

26290409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 26290409 is about 5127.4173810994. The cubic root of 26290409 is about 297.3485197333.

The spelling of 26290409 in words is "twenty-six million, two hundred ninety thousand, four hundred nine".