1220993 has 2 divisors, whose sum is σ = 1220994. Its totient is φ = 1220992.

The previous prime is 1220983. The next prime is 1221019. The reversal of 1220993 is 3990221.

It is an a-pointer prime, because the next prime (1221019) can be obtained adding 1220993 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1183744 + 37249 = 1088^2 + 193^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220993 - 2¹⁶ = 1155457 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p₉₄₄₁₈ and since 1220993 and 94418 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1220903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610496 + 610497.

It is an arithmetic number, because the mean of its divisors is an integer number (610497).

2^1220993 is an apocalyptic number.

It is an amenable number.

1220993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220993 is an equidigital number, since it uses as much as digits as its factorization.

1220993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 1220993 is about 1104.9855202671. The cubic root of 1220993 is about 106.8819555908.

The spelling of 1220993 in words is "one million, two hundred twenty thousand, nine hundred ninety-three".