25890247 has 4 divisors (see below), whose sum is σ = 25918816. Its totient is φ = 25861680.

The previous prime is 25890233. The next prime is 25890251. The reversal of 25890247 is 74209852.

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 25890247 - 2⁷ = 25890119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25890547) 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, 12879 + ... + 14752.

It is an arithmetic number, because the mean of its divisors is an integer number (6479704).

Almost surely, 2^25890247 is an apocalyptic number.

25890247 is a deficient number, since it is larger than the sum of its proper divisors (28569).

25890247 is an equidigital number, since it uses as much as digits as its factorization.

25890247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28568.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 25890247 is about 5088.2459649667. The cubic root of 25890247 is about 295.8321691329.

The spelling of 25890247 in words is "twenty-five million, eight hundred ninety thousand, two hundred forty-seven".