25738221 has 8 divisors (see below), whose sum is σ = 36336384. Its totient is φ = 16149440.

The previous prime is 25738183. The next prime is 25738241. The reversal of 25738221 is 12283752.

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 25738221 - 2¹⁰ = 25737197 is a prime.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25738241) 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, 252285 + ... + 252386.

It is an arithmetic number, because the mean of its divisors is an integer number (4542048).

Almost surely, 2^25738221 is an apocalyptic number.

It is an amenable number.

25738221 is a deficient number, since it is larger than the sum of its proper divisors (10598163).

25738221 is a wasteful number, since it uses less digits than its factorization.

25738221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504691.

The product of its digits is 6720, while the sum is 30.

The square root of 25738221 is about 5073.2850304315. The cubic root of 25738221 is about 295.2519957287.

It can be divided in two parts, 257382 and 21, that added together give a triangular number (257403 = T₇₁₇).

The spelling of 25738221 in words is "twenty-five million, seven hundred thirty-eight thousand, two hundred twenty-one".