25212725 has 24 divisors (see below), whose sum is σ = 32555208. Its totient is φ = 19353600.

The previous prime is 25212713. The next prime is 25212767. The reversal of 25212725 is 52721252.

It can be written as a sum of positive squares in 12 ways, for example, as 1456849 + 23755876 = 1207^2 + 4874^2 .

It is not a de Polignac number, because 25212725 - 2⁸ = 25212469 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25212694 and 25212703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89585 + ... + 89865.

It is an arithmetic number, because the mean of its divisors is an integer number (1356467).

Almost surely, 2^25212725 is an apocalyptic number.

25212725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25212725 is a deficient number, since it is larger than the sum of its proper divisors (7342483).

25212725 is a wasteful number, since it uses less digits than its factorization.

25212725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425 (or 420 counting only the distinct ones).

The product of its digits is 2800, while the sum is 26.

The square root of 25212725 is about 5021.2274395809. The cubic root of 25212725 is about 293.2287814664.

Adding to 25212725 its reverse (52721252), we get a palindrome (77933977).

The spelling of 25212725 in words is "twenty-five million, two hundred twelve thousand, seven hundred twenty-five".