1220843 has 4 divisors (see below), whose sum is σ = 1314768. Its totient is φ = 1126920.

The previous prime is 1220839. The next prime is 1220893. The reversal of 1220843 is 3480221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1220843 - 2² = 1220839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220803) 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, 46943 + ... + 46968.

It is an arithmetic number, because the mean of its divisors is an integer number (328692).

2^1220843 is an apocalyptic number.

1220843 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1220843 is a deficient number, since it is larger than the sum of its proper divisors (93925).

1220843 is an equidigital number, since it uses as much as digits as its factorization.

1220843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93924.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1220843 is about 1104.9176439898. The cubic root of 1220843 is about 106.8775785660.

The spelling of 1220843 in words is "one million, two hundred twenty thousand, eight hundred forty-three".