26490409 has 24 divisors (see below), whose sum is σ = 30708104. Its totient is φ = 22809600.

The previous prime is 26490391. The next prime is 26490419. The reversal of 26490409 is 90409462.

It can be written as a sum of positive squares in 4 ways, for example, as 2205225 + 24285184 = 1485^2 + 4928^2 .

It is not a de Polignac number, because 26490409 - 2⁵ = 26490377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26490419) 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 in 23 ways as a sum of consecutive naturals, for example, 273049 + ... + 273145.

Almost surely, 2^26490409 is an apocalyptic number.

It is an amenable number.

26490409 is a deficient number, since it is larger than the sum of its proper divisors (4217695).

26490409 is a wasteful number, since it uses less digits than its factorization.

26490409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 206 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 26490409 is about 5146.8834259190. The cubic root of 26490409 is about 298.1006258979.

The spelling of 26490409 in words is "twenty-six million, four hundred ninety thousand, four hundred nine".