25449947 has 2 divisors, whose sum is σ = 25449948. Its totient is φ = 25449946.

The previous prime is 25449943. The next prime is 25449959. The reversal of 25449947 is 74994452.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25449947 - 2² = 25449943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25449898 and 25449907.

It is not a weakly prime, because it can be changed into another prime (25449943) 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 as a sum of consecutive naturals, namely, 12724973 + 12724974.

It is an arithmetic number, because the mean of its divisors is an integer number (12724974).

Almost surely, 2^25449947 is an apocalyptic number.

25449947 is a deficient number, since it is larger than the sum of its proper divisors (1).

25449947 is an equidigital number, since it uses as much as digits as its factorization.

25449947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 44.

The square root of 25449947 is about 5044.7940493146. The cubic root of 25449947 is about 294.1455578305.

The spelling of 25449947 in words is "twenty-five million, four hundred forty-nine thousand, nine hundred forty-seven".