25949143 has 4 divisors (see below), whose sum is σ = 28308168. Its totient is φ = 23590120.

The previous prime is 25949141. The next prime is 25949153. The reversal of 25949143 is 34194952.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25949143 - 2¹ = 25949141 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 (25949141) 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 3 ways as a sum of consecutive naturals, for example, 1179496 + ... + 1179517.

It is an arithmetic number, because the mean of its divisors is an integer number (7077042).

Almost surely, 2^25949143 is an apocalyptic number.

25949143 is a deficient number, since it is larger than the sum of its proper divisors (2359025).

25949143 is a wasteful number, since it uses less digits than its factorization.

25949143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2359024.

The product of its digits is 38880, while the sum is 37.

The square root of 25949143 is about 5094.0301334013. The cubic root of 25949143 is about 296.0563222201.

The spelling of 25949143 in words is "twenty-five million, nine hundred forty-nine thousand, one hundred forty-three".