25655421 has 8 divisors (see below), whose sum is σ = 37317024. Its totient is φ = 15548720.

The previous prime is 25655417. The next prime is 25655423. The reversal of 25655421 is 12455652.

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

It is not a de Polignac number, because 25655421 - 2² = 25655417 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25655423) 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, 388686 + ... + 388751.

It is an arithmetic number, because the mean of its divisors is an integer number (4664628).

Almost surely, 2^25655421 is an apocalyptic number.

It is an amenable number.

25655421 is a deficient number, since it is larger than the sum of its proper divisors (11661603).

25655421 is a wasteful number, since it uses less digits than its factorization.

25655421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777451.

The product of its digits is 12000, while the sum is 30.

The square root of 25655421 is about 5065.1180637770. The cubic root of 25655421 is about 294.9350465058.

The spelling of 25655421 in words is "twenty-five million, six hundred fifty-five thousand, four hundred twenty-one".