13688749 has 8 divisors (see below), whose sum is σ = 14617152. Its totient is φ = 12788160.

The previous prime is 13688699. The next prime is 13688761. The reversal of 13688749 is 94788631.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13688749 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13688699 and 13688708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13688789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5932 + ... + 7909.

It is an arithmetic number, because the mean of its divisors is an integer number (1827144).

Almost surely, 2^13688749 is an apocalyptic number.

13688749 is the 1978-th nonagonal number.

It is an amenable number.

13688749 is a deficient number, since it is larger than the sum of its proper divisors (928403).

13688749 is a wasteful number, since it uses less digits than its factorization.

13688749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13907.

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

The square root of 13688749 is about 3699.8309420837. The cubic root of 13688749 is about 239.2147308911.

The spelling of 13688749 in words is "thirteen million, six hundred eighty-eight thousand, seven hundred forty-nine".