25849421 has 16 divisors (see below), whose sum is σ = 29091888. Its totient is φ = 22809600.

The previous prime is 25849391. The next prime is 25849423. The reversal of 25849421 is 12494852.

It can be written as a sum of positive squares in 8 ways, for example, as 4818025 + 21031396 = 2195^2 + 4586^2 .

It is a cyclic number.

It is not a de Polignac number, because 25849421 - 2¹⁴ = 25833037 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 (25849423) 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 15 ways as a sum of consecutive naturals, for example, 28901 + ... + 29781.

It is an arithmetic number, because the mean of its divisors is an integer number (1818243).

Almost surely, 2^25849421 is an apocalyptic number.

It is an amenable number.

25849421 is a deficient number, since it is larger than the sum of its proper divisors (3242467).

25849421 is a wasteful number, since it uses less digits than its factorization.

25849421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992.

The product of its digits is 23040, while the sum is 35.

The square root of 25849421 is about 5084.2325871266. The cubic root of 25849421 is about 295.6765893366.

The spelling of 25849421 in words is "twenty-five million, eight hundred forty-nine thousand, four hundred twenty-one".