26780921 has 4 divisors (see below), whose sum is σ = 27120000. Its totient is φ = 26441844.

The previous prime is 26780917. The next prime is 26780939. The reversal of 26780921 is 12908762.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 26780921 - 2² = 26780917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26780951) 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 3 ways as a sum of consecutive naturals, for example, 169421 + ... + 169578.

It is an arithmetic number, because the mean of its divisors is an integer number (6780000).

Almost surely, 2^26780921 is an apocalyptic number.

It is an amenable number.

26780921 is a deficient number, since it is larger than the sum of its proper divisors (339079).

26780921 is an equidigital number, since it uses as much as digits as its factorization.

26780921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339078.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 26780921 is about 5175.0285989548. The cubic root of 26780921 is about 299.1863917631.

The spelling of 26780921 in words is "twenty-six million, seven hundred eighty thousand, nine hundred twenty-one".