13988947 has 12 divisors (see below), whose sum is σ = 16339728. Its totient is φ = 11728800.

The previous prime is 13988941. The next prime is 13988957. The reversal of 13988947 is 74988931.

It is a happy number.

It is not a de Polignac number, because 13988947 - 2¹¹ = 13986899 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13988947.

It is not an unprimeable number, because it can be changed into a prime (13988941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77197 + ... + 77377.

It is an arithmetic number, because the mean of its divisors is an integer number (1361644).

Almost surely, 2^13988947 is an apocalyptic number.

13988947 is a deficient number, since it is larger than the sum of its proper divisors (2350781).

13988947 is an frugal number, since it uses more digits than its factorization.

13988947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430 (or 249 counting only the distinct ones).

The product of its digits is 435456, while the sum is 49.

The square root of 13988947 is about 3740.1800758787. The cubic root of 13988947 is about 240.9507828078.

The spelling of 13988947 in words is "thirteen million, nine hundred eighty-eight thousand, nine hundred forty-seven".