25990221 has 8 divisors (see below), whose sum is σ = 34677280. Its totient is φ = 17314992.

The previous prime is 25990147. The next prime is 25990247. The reversal of 25990221 is 12209952.

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

It is not a de Polignac number, because 25990221 - 2¹⁸ = 25728077 is a prime.

It is a super-3 number, since 3×25990221³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25990291) 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, 6435 + ... + 9663.

It is an arithmetic number, because the mean of its divisors is an integer number (4334660).

Almost surely, 2^25990221 is an apocalyptic number.

It is an amenable number.

25990221 is a deficient number, since it is larger than the sum of its proper divisors (8687059).

25990221 is a wasteful number, since it uses less digits than its factorization.

25990221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5915.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 25990221 is about 5098.0605135679. The cubic root of 25990221 is about 296.2124608383.

The spelling of 25990221 in words is "twenty-five million, nine hundred ninety thousand, two hundred twenty-one".