1338643 has 4 divisors (see below), whose sum is σ = 1341360. Its totient is φ = 1335928.

The previous prime is 1338641. The next prime is 1338647. The reversal of 1338643 is 3468331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3468331 = 23 ⋅150797.

It is a cyclic number.

It is not a de Polignac number, because 1338643 - 2¹ = 1338641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1338641) 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, 388 + ... + 1681.

It is an arithmetic number, because the mean of its divisors is an integer number (335340).

2^1338643 is an apocalyptic number.

1338643 is a deficient number, since it is larger than the sum of its proper divisors (2717).

1338643 is an equidigital number, since it uses as much as digits as its factorization.

1338643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2716.

The product of its digits is 5184, while the sum is 28.

The square root of 1338643 is about 1156.9974070844. The cubic root of 1338643 is about 110.2101492294.

The spelling of 1338643 in words is "one million, three hundred thirty-eight thousand, six hundred forty-three".