1213943 has 2 divisors, whose sum is σ = 1213944. Its totient is φ = 1213942.

The previous prime is 1213939. The next prime is 1213951. The reversal of 1213943 is 3493121.

It is a weak prime.

It is an emirp because it is prime and its reverse (3493121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1213943 - 2² = 1213939 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606971 + 606972.

It is an arithmetic number, because the mean of its divisors is an integer number (606972).

2^1213943 is an apocalyptic number.

1213943 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213943 is an equidigital number, since it uses as much as digits as its factorization.

1213943 is an evil number, because the sum of its binary digits is even.

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

The square root of 1213943 is about 1101.7908149917. The cubic root of 1213943 is about 106.6758466492.

The spelling of 1213943 in words is "one million, two hundred thirteen thousand, nine hundred forty-three".