26239921 has 2 divisors, whose sum is σ = 26239922. Its totient is φ = 26239920.

The previous prime is 26239909. The next prime is 26239937. The reversal of 26239921 is 12993262.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17472400 + 8767521 = 4180^2 + 2961^2 .

It is a cyclic number.

It is not a de Polignac number, because 26239921 - 2¹³ = 26231729 is a prime.

It is not a weakly prime, because it can be changed into another prime (26239951) 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 as a sum of consecutive naturals, namely, 13119960 + 13119961.

It is an arithmetic number, because the mean of its divisors is an integer number (13119961).

Almost surely, 2^26239921 is an apocalyptic number.

It is an amenable number.

26239921 is a deficient number, since it is larger than the sum of its proper divisors (1).

26239921 is an equidigital number, since it uses as much as digits as its factorization.

26239921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 34.

The square root of 26239921 is about 5122.4916788610. The cubic root of 26239921 is about 297.1580554422.

It can be divided in two parts, 2623 and 9921, that added together give a square (12544 = 112²).

The spelling of 26239921 in words is "twenty-six million, two hundred thirty-nine thousand, nine hundred twenty-one".