25849861 has 16 divisors (see below), whose sum is σ = 28656000. Its totient is φ = 23208768.

The previous prime is 25849853. The next prime is 25849871. The reversal of 25849861 is 16894852.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 25849861 - 2³ = 25849853 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 (25849801) 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, 64915 + ... + 65311.

It is an arithmetic number, because the mean of its divisors is an integer number (1791000).

Almost surely, 2^25849861 is an apocalyptic number.

It is an amenable number.

25849861 is a deficient number, since it is larger than the sum of its proper divisors (2806139).

25849861 is a wasteful number, since it uses less digits than its factorization.

25849861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588.

The product of its digits is 138240, while the sum is 43.

The square root of 25849861 is about 5084.2758579762. The cubic root of 25849861 is about 295.6782669623.

The spelling of 25849861 in words is "twenty-five million, eight hundred forty-nine thousand, eight hundred sixty-one".