25784947 has 4 divisors (see below), whose sum is σ = 26222040. Its totient is φ = 25347856.

The previous prime is 25784929. The next prime is 25784951. The reversal of 25784947 is 74948752.

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 25784947 - 2²³ = 17396339 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25784897 and 25784906.

It is not an unprimeable number, because it can be changed into a prime (25781947) 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, 218458 + ... + 218575.

It is an arithmetic number, because the mean of its divisors is an integer number (6555510).

Almost surely, 2^25784947 is an apocalyptic number.

25784947 is a deficient number, since it is larger than the sum of its proper divisors (437093).

25784947 is an equidigital number, since it uses as much as digits as its factorization.

25784947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437092.

The product of its digits is 564480, while the sum is 46.

The square root of 25784947 is about 5077.8880452409. Note that the first 3 decimals coincide. The cubic root of 25784947 is about 295.4305577283.

The spelling of 25784947 in words is "twenty-five million, seven hundred eighty-four thousand, nine hundred forty-seven".