25405243 has 4 divisors (see below), whose sum is σ = 25482328. Its totient is φ = 25328160.

The previous prime is 25405231. The next prime is 25405253. The reversal of 25405243 is 34250452.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25405243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25405253) 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, 38046 + ... + 38707.

It is an arithmetic number, because the mean of its divisors is an integer number (6370582).

Almost surely, 2^25405243 is an apocalyptic number.

25405243 is a deficient number, since it is larger than the sum of its proper divisors (77085).

25405243 is an equidigital number, since it uses as much as digits as its factorization.

25405243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77084.

The product of its (nonzero) digits is 4800, while the sum is 25.

The square root of 25405243 is about 5040.3613957731. The cubic root of 25405243 is about 293.9732301663.

Adding to 25405243 its reverse (34250452), we get a palindrome (59655695).

The spelling of 25405243 in words is "twenty-five million, four hundred five thousand, two hundred forty-three".