25978 has 8 divisors (see below), whose sum is σ = 40320. Its totient is φ = 12540.

The previous prime is 25969. The next prime is 25981. The reversal of 25978 is 87952.

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

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a nialpdrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148 + ... + 271.

It is an arithmetic number, because the mean of its divisors is an integer number (5040).

2²⁵⁹⁷⁸ is an apocalyptic number.

25978 is a deficient number, since it is larger than the sum of its proper divisors (14342).

25978 is a wasteful number, since it uses less digits than its factorization.

25978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452.

The product of its digits is 5040, while the sum is 31.

The square root of 25978 is about 161.1769214249. The cubic root of 25978 is about 29.6166025681.

25978 divided by its sum of digits (31) gives a palindrome (838).

It can be divided in two parts, 259 and 78, that multiplied together give a palindrome (20202).

The spelling of 25978 in words is "twenty-five thousand, nine hundred seventy-eight".