25746991 has 8 divisors (see below), whose sum is σ = 26072064. Its totient is φ = 25424280.

The previous prime is 25746989. The next prime is 25746997. The reversal of 25746991 is 19964752.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 25746991 - 2¹ = 25746989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25746997) 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, 30720 + ... + 31546.

It is an arithmetic number, because the mean of its divisors is an integer number (3259008).

Almost surely, 2^25746991 is an apocalyptic number.

25746991 is a deficient number, since it is larger than the sum of its proper divisors (325073).

25746991 is a wasteful number, since it uses less digits than its factorization.

25746991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181.

The product of its digits is 136080, while the sum is 43.

The square root of 25746991 is about 5074.1492883044. The cubic root of 25746991 is about 295.2855264838.

The spelling of 25746991 in words is "twenty-five million, seven hundred forty-six thousand, nine hundred ninety-one".