25525407 has 4 divisors (see below), whose sum is σ = 34033880. Its totient is φ = 17016936.

The previous prime is 25525403. The next prime is 25525421. The reversal of 25525407 is 70452552.

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

It is not a de Polignac number, because 25525407 - 2² = 25525403 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 (25525403) 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, 4254232 + ... + 4254237.

It is an arithmetic number, because the mean of its divisors is an integer number (8508470).

Almost surely, 2^25525407 is an apocalyptic number.

25525407 is a deficient number, since it is larger than the sum of its proper divisors (8508473).

25525407 is an equidigital number, since it uses as much as digits as its factorization.

25525407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8508472.

The product of its (nonzero) digits is 14000, while the sum is 30.

The square root of 25525407 is about 5052.2675107322. The cubic root of 25525407 is about 294.4359883283.

Adding to 25525407 its reverse (70452552), we get a palindrome (95977959).

The spelling of 25525407 in words is "twenty-five million, five hundred twenty-five thousand, four hundred seven".