13878946 has 4 divisors (see below), whose sum is σ = 20818422. Its totient is φ = 6939472.

The previous prime is 13878937. The next prime is 13878967. The reversal of 13878946 is 64987831.

It is a happy number.

13878946 is nontrivially palindromic in base 15.

13878946 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 13505625 + 373321 = 3675^2 + 611^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13878896 and 13878905.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3469735 + ... + 3469738.

Almost surely, 2^13878946 is an apocalyptic number.

13878946 is a deficient number, since it is larger than the sum of its proper divisors (6939476).

13878946 is an equidigital number, since it uses as much as digits as its factorization.

13878946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6939475.

The product of its digits is 290304, while the sum is 46.

The square root of 13878946 is about 3725.4457451425. The cubic root of 13878946 is about 240.3175541823.

The spelling of 13878946 in words is "thirteen million, eight hundred seventy-eight thousand, nine hundred forty-six".