26542409 has 4 divisors (see below), whose sum is σ = 26553540. Its totient is φ = 26531280.

The previous prime is 26542403. The next prime is 26542433. The reversal of 26542409 is 90424562.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 16321600 + 10220809 = 4040^2 + 3197^2 .

It is a cyclic number.

It is not a de Polignac number, because 26542409 - 2¹² = 26538313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26542403) 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, 374 + ... + 7295.

It is an arithmetic number, because the mean of its divisors is an integer number (6638385).

Almost surely, 2^26542409 is an apocalyptic number.

It is an amenable number.

26542409 is a deficient number, since it is larger than the sum of its proper divisors (11131).

26542409 is an equidigital number, since it uses as much as digits as its factorization.

26542409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11130.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 26542409 is about 5151.9325500243. The cubic root of 26542409 is about 298.2955530601.

The spelling of 26542409 in words is "twenty-six million, five hundred forty-two thousand, four hundred nine".