25991849 has 8 divisors (see below), whose sum is σ = 28114632. Its totient is φ = 23886720.

The previous prime is 25991843. The next prime is 25991851. The reversal of 25991849 is 94819952.

It can be written as a sum of positive squares in 4 ways, for example, as 2999824 + 22992025 = 1732^2 + 4795^2 .

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

It is not a de Polignac number, because 25991849 - 2⁸ = 25991593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25991843) 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, 1262 + ... + 7319.

It is an arithmetic number, because the mean of its divisors is an integer number (3514329).

Almost surely, 2^25991849 is an apocalyptic number.

It is an amenable number.

25991849 is a deficient number, since it is larger than the sum of its proper divisors (2122783).

25991849 is a wasteful number, since it uses less digits than its factorization.

25991849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8827.

The product of its digits is 233280, while the sum is 47.

The square root of 25991849 is about 5098.2201796313. The cubic root of 25991849 is about 296.2186455211.

The spelling of 25991849 in words is "twenty-five million, nine hundred ninety-one thousand, eight hundred forty-nine".