23825209 has 4 divisors (see below), whose sum is σ = 23846004. Its totient is φ = 23804416.

The previous prime is 23825201. The next prime is 23825227. The reversal of 23825209 is 90252832.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16426809 + 7398400 = 4053^2 + 2720^2 .

It is a cyclic number.

It is not a de Polignac number, because 23825209 - 2³ = 23825201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23825201) 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, 8572 + ... + 11005.

It is an arithmetic number, because the mean of its divisors is an integer number (5961501).

Almost surely, 2^23825209 is an apocalyptic number.

It is an amenable number.

23825209 is a deficient number, since it is larger than the sum of its proper divisors (20795).

23825209 is a wasteful number, since it uses less digits than its factorization.

23825209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20794.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 23825209 is about 4881.1073538696. The cubic root of 23825209 is about 287.7479509355.

The spelling of 23825209 in words is "twenty-three million, eight hundred twenty-five thousand, two hundred nine".