25816947 has 16 divisors (see below), whose sum is σ = 37299360. Its totient is φ = 15883296.

The previous prime is 25816927. The next prime is 25816951. The reversal of 25816947 is 74961852.

It is a de Polignac number, because none of the positive numbers 2^k-25816947 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 25816899 and 25816908.

It is not an unprimeable number, because it can be changed into a prime (25816907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4633 + ... + 8549.

It is an arithmetic number, because the mean of its divisors is an integer number (2331210).

Almost surely, 2^25816947 is an apocalyptic number.

25816947 is a deficient number, since it is larger than the sum of its proper divisors (11482413).

25816947 is an equidigital number, since it uses as much as digits as its factorization.

25816947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3959 (or 3933 counting only the distinct ones).

The product of its digits is 120960, while the sum is 42.

The square root of 25816947 is about 5081.0379845067. The cubic root of 25816947 is about 295.5527203441.

It can be divided in two parts, 258 and 16947, that added together give a triangular number (17205 = T₁₈₅).

The spelling of 25816947 in words is "twenty-five million, eight hundred sixteen thousand, nine hundred forty-seven".