13997643 has 12 divisors (see below), whose sum is σ = 20514984. Its totient is φ = 8483200.

The previous prime is 13997629. The next prime is 13997651. The reversal of 13997643 is 34679931.

It is not a de Polignac number, because 13997643 - 2⁵ = 13997611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13997595 and 13997604.

It is not an unprimeable number, because it can be changed into a prime (13997663) 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, 18918 + ... + 19643.

It is an arithmetic number, because the mean of its divisors is an integer number (1709582).

Almost surely, 2^13997643 is an apocalyptic number.

13997643 is a deficient number, since it is larger than the sum of its proper divisors (6517341).

13997643 is a wasteful number, since it uses less digits than its factorization.

13997643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38586 (or 38575 counting only the distinct ones).

The product of its digits is 122472, while the sum is 42.

The square root of 13997643 is about 3741.3424061425. The cubic root of 13997643 is about 241.0007001696. Note that the first 3 decimals are identical.

The spelling of 13997643 in words is "thirteen million, nine hundred ninety-seven thousand, six hundred forty-three".