14139978 has 8 divisors (see below), whose sum is σ = 28279968. Its totient is φ = 4713324.

The previous prime is 14139959. The next prime is 14140001. The reversal of 14139978 is 87993141.

It is a happy number.

14139978 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

14139978 is an admirable number.

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, 1178326 + ... + 1178337.

It is an arithmetic number, because the mean of its divisors is an integer number (3534996).

Almost surely, 2^14139978 is an apocalyptic number.

14139978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

14139978 is a wasteful number, since it uses less digits than its factorization.

14139978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2356668.

The product of its digits is 54432, while the sum is 42.

The square root of 14139978 is about 3760.3162101079. The cubic root of 14139978 is about 241.8148186044.

The spelling of 14139978 in words is "fourteen million, one hundred thirty-nine thousand, nine hundred seventy-eight".