13689778 has 8 divisors (see below), whose sum is σ = 21089772. Its totient is φ = 6659856.

The previous prime is 13689773. The next prime is 13689779. The reversal of 13689778 is 87798631.

13689778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 13638249 + 51529 = 3693^2 + 227^2 .

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

It is not an unprimeable number, because it can be changed into a prime (13689773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92425 + ... + 92572.

Almost surely, 2^13689778 is an apocalyptic number.

13689778 is a deficient number, since it is larger than the sum of its proper divisors (7399994).

13689778 is a wasteful number, since it uses less digits than its factorization.

13689778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185036.

The product of its digits is 508032, while the sum is 49.

The square root of 13689778 is about 3699.9699998784. The cubic root of 13689778 is about 239.2207247622.

The spelling of 13689778 in words is "thirteen million, six hundred eighty-nine thousand, seven hundred seventy-eight".