26389009 has 4 divisors (see below), whose sum is σ = 26631220. Its totient is φ = 26146800.

The previous prime is 26389007. The next prime is 26389019. The reversal of 26389009 is 90098362.

26389009 = T₂₂₇ + T₂₂₈ + ... + T₅₅₃.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90098362 = 2 ⋅45049181.

It can be written as a sum of positive squares in 2 ways, for example, as 15233409 + 11155600 = 3903^2 + 3340^2 .

It is a cyclic number.

It is not a de Polignac number, because 26389009 - 2¹ = 26389007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26389001) 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, 120942 + ... + 121159.

It is an arithmetic number, because the mean of its divisors is an integer number (6657805).

Almost surely, 2^26389009 is an apocalyptic number.

It is an amenable number.

26389009 is a deficient number, since it is larger than the sum of its proper divisors (242211).

26389009 is a wasteful number, since it uses less digits than its factorization.

26389009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242210.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 26389009 is about 5137.0233598846. The cubic root of 26389009 is about 297.7197829817.

The spelling of 26389009 in words is "twenty-six million, three hundred eighty-nine thousand, nine".