25798381 has 4 divisors (see below), whose sum is σ = 29483872. Its totient is φ = 22112892.

The previous prime is 25798379. The next prime is 25798391. The reversal of 25798381 is 18389752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25798381 - 2¹ = 25798379 is a prime.

It is a super-2 number, since 2×25798381² = 1331112924442322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25798391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1842735 + ... + 1842748.

It is an arithmetic number, because the mean of its divisors is an integer number (7370968).

Almost surely, 2^25798381 is an apocalyptic number.

It is an amenable number.

25798381 is a deficient number, since it is larger than the sum of its proper divisors (3685491).

25798381 is an equidigital number, since it uses as much as digits as its factorization.

25798381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3685490.

The product of its digits is 120960, while the sum is 43.

The square root of 25798381 is about 5079.2106670230. The cubic root of 25798381 is about 295.4818554236.

It can be divided in two parts, 257983 and 81, that added together give a square (258064 = 508²).

The spelling of 25798381 in words is "twenty-five million, seven hundred ninety-eight thousand, three hundred eighty-one".