25991026 has 16 divisors (see below), whose sum is σ = 39726720. Its totient is φ = 12751200.

The previous prime is 25991023. The next prime is 25991029. The reversal of 25991026 is 62019952.

It is an interprime number because it is at equal distance from previous prime (25991023) and next prime (25991029).

It is a junction number, because it is equal to n+sod(n) for n = 25990982 and 25991000.

It is not an unprimeable number, because it can be changed into a prime (25991023) 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 7 ways as a sum of consecutive naturals, for example, 26395 + ... + 27361.

It is an arithmetic number, because the mean of its divisors is an integer number (2482920).

Almost surely, 2^25991026 is an apocalyptic number.

25991026 is a deficient number, since it is larger than the sum of its proper divisors (13735694).

25991026 is a wasteful number, since it uses less digits than its factorization.

25991026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 25991026 is about 5098.1394645498. The cubic root of 25991026 is about 296.2155190215.

The spelling of 25991026 in words is "twenty-five million, nine hundred ninety-one thousand, twenty-six".