1213843 has 4 divisors (see below), whose sum is σ = 1217160. Its totient is φ = 1210528.

The previous prime is 1213841. The next prime is 1213873. The reversal of 1213843 is 3483121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3483121 = 257 ⋅13553.

It is a cyclic number.

It is not a de Polignac number, because 1213843 - 2¹ = 1213841 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (1213841) 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, 1030 + ... + 1867.

It is an arithmetic number, because the mean of its divisors is an integer number (304290).

2^1213843 is an apocalyptic number.

1213843 is a deficient number, since it is larger than the sum of its proper divisors (3317).

1213843 is an equidigital number, since it uses as much as digits as its factorization.

1213843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3316.

The product of its digits is 576, while the sum is 22.

The square root of 1213843 is about 1101.7454333919. The cubic root of 1213843 is about 106.6729173854.

Adding to 1213843 its reverse (3483121), we get a palindrome (4696964).

The spelling of 1213843 in words is "one million, two hundred thirteen thousand, eight hundred forty-three".