25429978 has 16 divisors (see below), whose sum is σ = 43675200. Its totient is φ = 10878336.

The previous prime is 25429967. The next prime is 25429981. The reversal of 25429978 is 87992452.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8073 + ... + 10771.

It is an arithmetic number, because the mean of its divisors is an integer number (2729700).

Almost surely, 2^25429978 is an apocalyptic number.

25429978 is a deficient number, since it is larger than the sum of its proper divisors (18245222).

25429978 is a wasteful number, since it uses less digits than its factorization.

25429978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3381.

The product of its digits is 362880, while the sum is 46.

The square root of 25429978 is about 5042.8144919281. The cubic root of 25429978 is about 294.0686050889.

The spelling of 25429978 in words is "twenty-five million, four hundred twenty-nine thousand, nine hundred seventy-eight".