25216829 has 4 divisors (see below), whose sum is σ = 27509280. Its totient is φ = 22924380.

The previous prime is 25216783. The next prime is 25216843. The reversal of 25216829 is 92861252.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25216829 - 2²⁰ = 24168253 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 (25216859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1146209 + ... + 1146230.

It is an arithmetic number, because the mean of its divisors is an integer number (6877320).

Almost surely, 2^25216829 is an apocalyptic number.

It is an amenable number.

25216829 is a deficient number, since it is larger than the sum of its proper divisors (2292451).

25216829 is a wasteful number, since it uses less digits than its factorization.

25216829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2292450.

The product of its digits is 17280, while the sum is 35.

The square root of 25216829 is about 5021.6360879697. The cubic root of 25216829 is about 293.2446907031.

The spelling of 25216829 in words is "twenty-five million, two hundred sixteen thousand, eight hundred twenty-nine".