26240391 has 6 divisors (see below), whose sum is σ = 37902800. Its totient is φ = 17493588.

The previous prime is 26240377. The next prime is 26240399. The reversal of 26240391 is 19304262.

26240391 is a `hidden beast` number, since 2 + 624 + 0 + 39 + 1 = 666.

It is not a de Polignac number, because 26240391 - 2⁹ = 26239879 is a prime.

It is a super-4 number, since 4×26240391⁴ (a number of 31 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26240399) 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 5 ways as a sum of consecutive naturals, for example, 1457791 + ... + 1457808.

Almost surely, 2^26240391 is an apocalyptic number.

26240391 is a deficient number, since it is larger than the sum of its proper divisors (11662409).

26240391 is a wasteful number, since it uses less digits than its factorization.

26240391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2915605 (or 2915602 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 26240391 is about 5122.5375547672. The cubic root of 26240391 is about 297.1598296276.

The spelling of 26240391 in words is "twenty-six million, two hundred forty thousand, three hundred ninety-one".