25400243 has 4 divisors (see below), whose sum is σ = 27709368. Its totient is φ = 23091120.

The previous prime is 25400233. The next prime is 25400251. The reversal of 25400243 is 34200452.

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

It is a cyclic number.

It is not a de Polignac number, because 25400243 - 2⁸ = 25399987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25400233) 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 3 ways as a sum of consecutive naturals, for example, 1154546 + ... + 1154567.

It is an arithmetic number, because the mean of its divisors is an integer number (6927342).

Almost surely, 2^25400243 is an apocalyptic number.

25400243 is a deficient number, since it is larger than the sum of its proper divisors (2309125).

25400243 is a wasteful number, since it uses less digits than its factorization.

25400243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2309124.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 25400243 is about 5039.8653751861. The cubic root of 25400243 is about 293.9539432998.

Adding to 25400243 its reverse (34200452), we get a palindrome (59600695).

The spelling of 25400243 in words is "twenty-five million, four hundred thousand, two hundred forty-three".