13656747 has 16 divisors (see below), whose sum is σ = 19704608. Its totient is φ = 8363520.

The previous prime is 13656739. The next prime is 13656749. The reversal of 13656747 is 74765631.

It is not a de Polignac number, because 13656747 - 2³ = 13656739 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13656749) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 8673 + ... + 10125.

It is an arithmetic number, because the mean of its divisors is an integer number (1231538).

Almost surely, 2^13656747 is an apocalyptic number.

13656747 is a deficient number, since it is larger than the sum of its proper divisors (6047861).

13656747 is a wasteful number, since it uses less digits than its factorization.

13656747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710.

The product of its digits is 105840, while the sum is 39.

The square root of 13656747 is about 3695.5036192649. The cubic root of 13656747 is about 239.0281707893.

The spelling of 13656747 in words is "thirteen million, six hundred fifty-six thousand, seven hundred forty-seven".