25800123 has 4 divisors (see below), whose sum is σ = 34400168. Its totient is φ = 17200080.

The previous prime is 25800107. The next prime is 25800127. The reversal of 25800123 is 32100852.

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

It is not a de Polignac number, because 25800123 - 2⁴ = 25800107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25800123.

It is not an unprimeable number, because it can be changed into a prime (25800127) 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, 4300018 + ... + 4300023.

It is an arithmetic number, because the mean of its divisors is an integer number (8600042).

Almost surely, 2^25800123 is an apocalyptic number.

25800123 is a deficient number, since it is larger than the sum of its proper divisors (8600045).

25800123 is an equidigital number, since it uses as much as digits as its factorization.

25800123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8600044.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 25800123 is about 5079.3821474664. The cubic root of 25800123 is about 295.4885059418.

Adding to 25800123 its reverse (32100852), we get a palindrome (57900975).

The spelling of 25800123 in words is "twenty-five million, eight hundred thousand, one hundred twenty-three".