25881989 has 4 divisors (see below), whose sum is σ = 29579424. Its totient is φ = 22184556.

The previous prime is 25881983. The next prime is 25882013. The reversal of 25881989 is 98918852.

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 25881989 - 2²⁴ = 9104773 is a prime.

It is a super-2 number, since 2×25881989² = 1339754709192242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25881983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1848707 + ... + 1848720.

It is an arithmetic number, because the mean of its divisors is an integer number (7394856).

Almost surely, 2^25881989 is an apocalyptic number.

It is an amenable number.

25881989 is a deficient number, since it is larger than the sum of its proper divisors (3697435).

25881989 is an equidigital number, since it uses as much as digits as its factorization.

25881989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3697434.

The product of its digits is 414720, while the sum is 50.

The square root of 25881989 is about 5087.4344221818. The cubic root of 25881989 is about 295.8007127337.

The spelling of 25881989 in words is "twenty-five million, eight hundred eighty-one thousand, nine hundred eighty-nine".