25009443 has 6 divisors (see below), whose sum is σ = 36124764. Its totient is φ = 16672956.

The previous prime is 25009433. The next prime is 25009463. The reversal of 25009443 is 34490052.

It is not a de Polignac number, because 25009443 - 2⁴ = 25009427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25009403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1389405 + ... + 1389422.

It is an arithmetic number, because the mean of its divisors is an integer number (6020794).

Almost surely, 2^25009443 is an apocalyptic number.

25009443 is a deficient number, since it is larger than the sum of its proper divisors (11115321).

25009443 is a wasteful number, since it uses less digits than its factorization.

25009443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2778833 (or 2778830 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 25009443 is about 5000.9442108466. The cubic root of 25009443 is about 292.4385845196.

Adding to 25009443 its reverse (34490052), we get a palindrome (59499495).

It can be divided in two parts, 25009 and 443, that added together give a palindrome (25452).

The spelling of 25009443 in words is "twenty-five million, nine thousand, four hundred forty-three".