25543979 has 8 divisors (see below), whose sum is σ = 27352080. Its totient is φ = 23769856.

The previous prime is 25543967. The next prime is 25543993. The reversal of 25543979 is 97934552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25543979 - 2⁴ = 25543963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25543909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6929 + ... + 9954.

It is an arithmetic number, because the mean of its divisors is an integer number (3419010).

Almost surely, 2^25543979 is an apocalyptic number.

25543979 is a deficient number, since it is larger than the sum of its proper divisors (1808101).

25543979 is a wasteful number, since it uses less digits than its factorization.

25543979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16989.

The product of its digits is 340200, while the sum is 44.

The square root of 25543979 is about 5054.1051631322. The cubic root of 25543979 is about 294.5073804579.

The spelling of 25543979 in words is "twenty-five million, five hundred forty-three thousand, nine hundred seventy-nine".