13553643 has 16 divisors (see below), whose sum is σ = 19134720. Its totient is φ = 8518944.

The previous prime is 13553633. The next prime is 13553671. The reversal of 13553643 is 34635531.

It is a happy number.

It is not a de Polignac number, because 13553643 - 2⁴ = 13553627 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13553643.

It is not an unprimeable number, because it can be changed into a prime (13553623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1930 + ... + 5552.

It is an arithmetic number, because the mean of its divisors is an integer number (1195920).

Almost surely, 2^13553643 is an apocalyptic number.

13553643 is a deficient number, since it is larger than the sum of its proper divisors (5581077).

13553643 is a wasteful number, since it uses less digits than its factorization.

13553643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3698.

The product of its digits is 16200, while the sum is 30.

The square root of 13553643 is about 3681.5272646009. The cubic root of 13553643 is about 238.4251223000.

It can be divided in two parts, 13553 and 643, that added together give a triangular number (14196 = T₁₆₈).

The spelling of 13553643 in words is "thirteen million, five hundred fifty-three thousand, six hundred forty-three".