26109409 has 12 divisors (see below), whose sum is σ = 27347220. Its totient is φ = 24924000.

The previous prime is 26109389. The next prime is 26109449. The reversal of 26109409 is 90490162.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13838400 + 12271009 = 3720^2 + 3503^2 .

It is not a de Polignac number, because 26109409 - 2⁹ = 26108897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26109449) 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 in 11 ways as a sum of consecutive naturals, for example, 96927 + ... + 97195.

It is an arithmetic number, because the mean of its divisors is an integer number (2278935).

Almost surely, 2^26109409 is an apocalyptic number.

It is an amenable number.

26109409 is a deficient number, since it is larger than the sum of its proper divisors (1237811).

26109409 is a wasteful number, since it uses less digits than its factorization.

26109409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432 (or 401 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 26109409 is about 5109.7366859751. The cubic root of 26109409 is about 296.6645685722.

The spelling of 26109409 in words is "twenty-six million, one hundred nine thousand, four hundred nine".