25217993 has 8 divisors (see below), whose sum is σ = 26199936. Its totient is φ = 24253600.

The previous prime is 25217989. The next prime is 25218013. The reversal of 25217993 is 39971252.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25217993 - 2² = 25217989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25217903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1421 + ... + 7242.

It is an arithmetic number, because the mean of its divisors is an integer number (3274992).

Almost surely, 2^25217993 is an apocalyptic number.

It is an amenable number.

25217993 is a deficient number, since it is larger than the sum of its proper divisors (981943).

25217993 is an equidigital number, since it uses as much as digits as its factorization.

25217993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8775.

The product of its digits is 34020, while the sum is 38.

The square root of 25217993 is about 5021.7519851144. The cubic root of 25217993 is about 293.2492026578.

The spelling of 25217993 in words is "twenty-five million, two hundred seventeen thousand, nine hundred ninety-three".