26421009 has 8 divisors (see below), whose sum is σ = 37300320. Its totient is φ = 16577856.

The previous prime is 26420993. The next prime is 26421019. The reversal of 26421009 is 90012462.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 26421009 - 2⁴ = 26420993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26421009.

It is not an unprimeable number, because it can be changed into a prime (26421019) 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 7 ways as a sum of consecutive naturals, for example, 258979 + ... + 259080.

It is an arithmetic number, because the mean of its divisors is an integer number (4662540).

Almost surely, 2^26421009 is an apocalyptic number.

It is an amenable number.

26421009 is a deficient number, since it is larger than the sum of its proper divisors (10879311).

26421009 is a wasteful number, since it uses less digits than its factorization.

26421009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518079.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 26421009 is about 5140.1370604294. The cubic root of 26421009 is about 297.8400752940.

The spelling of 26421009 in words is "twenty-six million, four hundred twenty-one thousand, nine".