25826991 has 8 divisors (see below), whose sum is σ = 34559664. Its totient is φ = 17156160.

The previous prime is 25826987. The next prime is 25826993. The reversal of 25826991 is 19962852.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25826991 - 2² = 25826987 is a prime.

It is a super-2 number, since 2×25826991² = 1334066928228162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25826993) 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, 14476 + ... + 16161.

It is an arithmetic number, because the mean of its divisors is an integer number (4319958).

Almost surely, 2^25826991 is an apocalyptic number.

25826991 is a deficient number, since it is larger than the sum of its proper divisors (8732673).

25826991 is a wasteful number, since it uses less digits than its factorization.

25826991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30921.

The product of its digits is 77760, while the sum is 42.

The square root of 25826991 is about 5082.0262691175. The cubic root of 25826991 is about 295.5910433191.

The spelling of 25826991 in words is "twenty-five million, eight hundred twenty-six thousand, nine hundred ninety-one".