25999971 has 8 divisors (see below), whose sum is σ = 34778640. Its totient is φ = 17277312.

The previous prime is 25999949. The next prime is 26000003. The reversal of 25999971 is 17999952.

25999971 is nontrivially palindromic in base 2.

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

It is not a de Polignac number, because 25999971 - 2⁷ = 25999843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25999871) 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, 12906 + ... + 14783.

It is an arithmetic number, because the mean of its divisors is an integer number (4347330).

Almost surely, 2^25999971 is an apocalyptic number.

25999971 is a deficient number, since it is larger than the sum of its proper divisors (8778669).

25999971 is a wasteful number, since it uses less digits than its factorization.

25999971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28005.

The product of its digits is 459270, while the sum is 51.

The square root of 25999971 is about 5099.0166699080. The cubic root of 25999971 is about 296.2494966966.

The spelling of 25999971 in words is "twenty-five million, nine hundred ninety-nine thousand, nine hundred seventy-one".