2013643 has 4 divisors (see below), whose sum is σ = 2018848. Its totient is φ = 2008440.

The previous prime is 2013619. The next prime is 2013653. The reversal of 2013643 is 3463102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3463102 = 2 ⋅1731551.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2013643 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 2013643.

It is not an unprimeable number, because it can be changed into a prime (2013653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1971 + ... + 2812.

It is an arithmetic number, because the mean of its divisors is an integer number (504712).

2^2013643 is an apocalyptic number.

2013643 is a deficient number, since it is larger than the sum of its proper divisors (5205).

2013643 is an equidigital number, since it uses as much as digits as its factorization.

2013643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5204.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 2013643 is about 1419.0288932929. The cubic root of 2013643 is about 126.2779410758.

Adding to 2013643 its reverse (3463102), we get a palindrome (5476745).

It can be divided in two parts, 201 and 3643, that added together give a square (3844 = 62²).

The spelling of 2013643 in words is "two million, thirteen thousand, six hundred forty-three".