25433989 has 24 divisors (see below), whose sum is σ = 32996160. Its totient is φ = 19426176.

The previous prime is 25433963. The next prime is 25433999. The reversal of 25433989 is 98933452.

It is not a de Polignac number, because 25433989 - 2⁹ = 25433477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25433999) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15024 + ... + 16630.

It is an arithmetic number, because the mean of its divisors is an integer number (1374840).

Almost surely, 2^25433989 is an apocalyptic number.

It is an amenable number.

25433989 is a deficient number, since it is larger than the sum of its proper divisors (7562171).

25433989 is a wasteful number, since it uses less digits than its factorization.

25433989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1657 (or 1650 counting only the distinct ones).

The product of its digits is 233280, while the sum is 43.

The square root of 25433989 is about 5043.2121708292. The cubic root of 25433989 is about 294.0840651517.

It can be divided in two parts, 254 and 33989, that added together give a palindrome (34243).

The spelling of 25433989 in words is "twenty-five million, four hundred thirty-three thousand, nine hundred eighty-nine".