25256947 has 4 divisors (see below), whose sum is σ = 26586280. Its totient is φ = 23927616.

The previous prime is 25256927. The next prime is 25256963. The reversal of 25256947 is 74965252.

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 25256947 - 2¹¹ = 25254899 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25256927) 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, 664638 + ... + 664675.

It is an arithmetic number, because the mean of its divisors is an integer number (6646570).

Almost surely, 2^25256947 is an apocalyptic number.

25256947 is a deficient number, since it is larger than the sum of its proper divisors (1329333).

25256947 is a wasteful number, since it uses less digits than its factorization.

25256947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329332.

The product of its digits is 151200, while the sum is 40.

The square root of 25256947 is about 5025.6290153572. The cubic root of 25256947 is about 293.4001180868.

The spelling of 25256947 in words is "twenty-five million, two hundred fifty-six thousand, nine hundred forty-seven".