1943213 has 4 divisors (see below), whose sum is σ = 1988448. Its totient is φ = 1897980.

The previous prime is 1943209. The next prime is 1943231. The reversal of 1943213 is 3123491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1943213 - 2² = 1943209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1943243) 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 3 ways as a sum of consecutive naturals, for example, 22553 + ... + 22638.

It is an arithmetic number, because the mean of its divisors is an integer number (497112).

2^1943213 is an apocalyptic number.

It is an amenable number.

1943213 is a deficient number, since it is larger than the sum of its proper divisors (45235).

1943213 is an equidigital number, since it uses as much as digits as its factorization.

1943213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45234.

The product of its digits is 648, while the sum is 23.

The square root of 1943213 is about 1393.9917503343. The cubic root of 1943213 is about 124.7881852789.

Adding to 1943213 its sum of digits (23), we get a square (1943236 = 1394²).

The spelling of 1943213 in words is "one million, nine hundred forty-three thousand, two hundred thirteen".