25855621 has 8 divisors (see below), whose sum is σ = 28260288. Its totient is φ = 23460000.

The previous prime is 25855603. The next prime is 25855639. The reversal of 25855621 is 12655852.

It is an interprime number because it is at equal distance from previous prime (25855603) and next prime (25855639).

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

It is a cyclic number.

It is not a de Polignac number, because 25855621 - 2¹⁷ = 25724549 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 (25855121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4656 + ... + 8566.

It is an arithmetic number, because the mean of its divisors is an integer number (3532536).

Almost surely, 2^25855621 is an apocalyptic number.

It is an amenable number.

25855621 is a deficient number, since it is larger than the sum of its proper divisors (2404667).

25855621 is a wasteful number, since it uses less digits than its factorization.

25855621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4523.

The product of its digits is 24000, while the sum is 34.

The square root of 25855621 is about 5084.8422787733. The cubic root of 25855621 is about 295.7002268526.

The spelling of 25855621 in words is "twenty-five million, eight hundred fifty-five thousand, six hundred twenty-one".