1123729 has 2 divisors, whose sum is σ = 1123730. Its totient is φ = 1123728.

The previous prime is 1123709. The next prime is 1123739. The reversal of 1123729 is 9273211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 819025 + 304704 = 905^2 + 552^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123729 - 2⁷ = 1123601 is a prime.

It is not a weakly prime, because it can be changed into another prime (1123709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561864 + 561865.

It is an arithmetic number, because the mean of its divisors is an integer number (561865).

2^1123729 is an apocalyptic number.

It is an amenable number.

1123729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123729 is an equidigital number, since it uses as much as digits as its factorization.

1123729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756, while the sum is 25.

The square root of 1123729 is about 1060.0608473102. The cubic root of 1123729 is about 103.9650091853.

The spelling of 1123729 in words is "one million, one hundred twenty-three thousand, seven hundred twenty-nine".