26240721 has 16 divisors (see below), whose sum is σ = 37773120. Its totient is φ = 16107840.

The previous prime is 26240701. The next prime is 26240749. The reversal of 26240721 is 12704262.

It is not a de Polignac number, because 26240721 - 2¹⁵ = 26207953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26240691 and 26240700.

It is not an unprimeable number, because it can be changed into a prime (26240701) 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 15 ways as a sum of consecutive naturals, for example, 25191 + ... + 26211.

It is an arithmetic number, because the mean of its divisors is an integer number (2360820).

Almost surely, 2^26240721 is an apocalyptic number.

It is an amenable number.

26240721 is a deficient number, since it is larger than the sum of its proper divisors (11532399).

26240721 is a wasteful number, since it uses less digits than its factorization.

26240721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 26240721 is about 5122.5697652643. The cubic root of 26240721 is about 297.1610753196.

Adding to 26240721 its reverse (12704262), we get a palindrome (38944983).

The spelling of 26240721 in words is "twenty-six million, two hundred forty thousand, seven hundred twenty-one".