1222729 has 2 divisors, whose sum is σ = 1222730. Its totient is φ = 1222728.

The previous prime is 1222723. The next prime is 1222751. The reversal of 1222729 is 9272221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1040400 + 182329 = 1020^2 + 427^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222729 - 2⁷ = 1222601 is a prime.

It is not a weakly prime, because it can be changed into another prime (1222723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611364 + 611365.

It is an arithmetic number, because the mean of its divisors is an integer number (611365).

2^1222729 is an apocalyptic number.

It is an amenable number.

1222729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222729 is an equidigital number, since it uses as much as digits as its factorization.

1222729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 25.

The square root of 1222729 is about 1105.7707719053. The cubic root of 1222729 is about 106.9325862954.

The spelling of 1222729 in words is "one million, two hundred twenty-two thousand, seven hundred twenty-nine".