1221983 has 4 divisors (see below), whose sum is σ = 1396560. Its totient is φ = 1047408.

The previous prime is 1221971. The next prime is 1222003. The reversal of 1221983 is 3891221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3891221 = 1697 ⋅2293.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221983 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 (1221083) 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, 87278 + ... + 87291.

It is an arithmetic number, because the mean of its divisors is an integer number (349140).

2^1221983 is an apocalyptic number.

1221983 is a deficient number, since it is larger than the sum of its proper divisors (174577).

1221983 is an equidigital number, since it uses as much as digits as its factorization.

1221983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174576.

The product of its digits is 864, while the sum is 26.

The square root of 1221983 is about 1105.4333991698. The cubic root of 1221983 is about 106.9108349675.

The spelling of 1221983 in words is "one million, two hundred twenty-one thousand, nine hundred eighty-three".