25143989 has 6 divisors (see below), whose sum is σ = 27227106. Its totient is φ = 23209680.

The previous prime is 25143931. The next prime is 25144019. The reversal of 25143989 is 98934152.

It can be written as a sum of positive squares in 3 ways, for example, as 293764 + 24850225 = 542^2 + 4985^2 .

It is not a de Polignac number, because 25143989 - 2⁸ = 25143733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25143389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 74222 + ... + 74559.

It is an arithmetic number, because the mean of its divisors is an integer number (4537851).

Almost surely, 2^25143989 is an apocalyptic number.

It is an amenable number.

25143989 is a deficient number, since it is larger than the sum of its proper divisors (2083117).

25143989 is a wasteful number, since it uses less digits than its factorization.

25143989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148807 (or 148794 counting only the distinct ones).

The product of its digits is 77760, while the sum is 41.

The square root of 25143989 is about 5014.3782266598. The cubic root of 25143989 is about 292.9620680315.

The spelling of 25143989 in words is "twenty-five million, one hundred forty-three thousand, nine hundred eighty-nine".