25986891 has 8 divisors (see below), whose sum is σ = 39599104. Its totient is φ = 14849640.

The previous prime is 25986881. The next prime is 25986937. The reversal of 25986891 is 19868952.

It is a happy number.

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

It is not a de Polignac number, because 25986891 - 2⁶ = 25986827 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25986891.

It is not an unprimeable number, because it can be changed into a prime (25986881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 618715 + ... + 618756.

It is an arithmetic number, because the mean of its divisors is an integer number (4949888).

Almost surely, 2^25986891 is an apocalyptic number.

25986891 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

25986891 is a deficient number, since it is larger than the sum of its proper divisors (13612213).

25986891 is a wasteful number, since it uses less digits than its factorization.

25986891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237481.

The product of its digits is 311040, while the sum is 48.

The square root of 25986891 is about 5097.7339083165. The cubic root of 25986891 is about 296.1998095464.

The spelling of 25986891 in words is "twenty-five million, nine hundred eighty-six thousand, eight hundred ninety-one".