25839949 has 8 divisors (see below), whose sum is σ = 28100088. Its totient is φ = 23662080.

The previous prime is 25839937. The next prime is 25839959. The reversal of 25839949 is 94993852.

It can be written as a sum of positive squares in 4 ways, for example, as 11437924 + 14402025 = 3382^2 + 3795^2 .

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 25839949 - 2²³ = 17451341 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 (25839959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19912 + ... + 21169.

It is an arithmetic number, because the mean of its divisors is an integer number (3512511).

Almost surely, 2^25839949 is an apocalyptic number.

It is an amenable number.

25839949 is a deficient number, since it is larger than the sum of its proper divisors (2260139).

25839949 is a wasteful number, since it uses less digits than its factorization.

25839949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41135.

The product of its digits is 699840, while the sum is 49.

The square root of 25839949 is about 5083.3009944327. The cubic root of 25839949 is about 295.6404700130.

The spelling of 25839949 in words is "twenty-five million, eight hundred thirty-nine thousand, nine hundred forty-nine".