25490247 has 4 divisors (see below), whose sum is σ = 33987000. Its totient is φ = 16993496.

The previous prime is 25490221. The next prime is 25490249. The reversal of 25490247 is 74209452.

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 25490247 - 2¹⁸ = 25228103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25490249) 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, 4248372 + ... + 4248377.

It is an arithmetic number, because the mean of its divisors is an integer number (8496750).

Almost surely, 2^25490247 is an apocalyptic number.

25490247 is a deficient number, since it is larger than the sum of its proper divisors (8496753).

25490247 is an equidigital number, since it uses as much as digits as its factorization.

25490247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8496752.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 25490247 is about 5048.7866859276. The cubic root of 25490247 is about 294.3007358158.

Adding to 25490247 its reverse (74209452), we get a palindrome (99699699).

The spelling of 25490247 in words is "twenty-five million, four hundred ninety thousand, two hundred forty-seven".