26257115 has 4 divisors (see below), whose sum is σ = 31508544. Its totient is φ = 21005688.

The previous prime is 26257109. The next prime is 26257117. The reversal of 26257115 is 51175262.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51175262 = 2 ⋅25587631.

It is a cyclic number.

It is not a de Polignac number, because 26257115 - 2¹⁸ = 25994971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26257117) 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, 2625707 + ... + 2625716.

It is an arithmetic number, because the mean of its divisors is an integer number (7877136).

Almost surely, 2^26257115 is an apocalyptic number.

26257115 is a deficient number, since it is larger than the sum of its proper divisors (5251429).

26257115 is an equidigital number, since it uses as much as digits as its factorization.

26257115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5251428.

The product of its digits is 4200, while the sum is 29.

The square root of 26257115 is about 5124.1696888374. The cubic root of 26257115 is about 297.2229466441. Note that the first 3 decimals are identical.

The spelling of 26257115 in words is "twenty-six million, two hundred fifty-seven thousand, one hundred fifteen".