25842861 has 16 divisors (see below), whose sum is σ = 41766720. Its totient is φ = 15662160.

The previous prime is 25842851. The next prime is 25842863. The reversal of 25842861 is 16824852.

It is not a de Polignac number, because 25842861 - 2⁵ = 25842829 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25842863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43210 + ... + 43803.

It is an arithmetic number, because the mean of its divisors is an integer number (2610420).

Almost surely, 2^25842861 is an apocalyptic number.

It is an amenable number.

25842861 is a deficient number, since it is larger than the sum of its proper divisors (15923859).

25842861 is a wasteful number, since it uses less digits than its factorization.

25842861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87033 (or 87027 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 25842861 is about 5083.5874144151. The cubic root of 25842861 is about 295.6515752041.

Subtracting from 25842861 its reverse (16824852), we obtain a square (9018009 = 3003²).

It can be divided in two parts, 2584 and 2861, that added together give a palindrome (5445).

The spelling of 25842861 in words is "twenty-five million, eight hundred forty-two thousand, eight hundred sixty-one".