1273729 has 2 divisors, whose sum is σ = 1273730. Its totient is φ = 1273728.

The previous prime is 1273721. The next prime is 1273733. The reversal of 1273729 is 9273721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1270129 + 3600 = 1127^2 + 60^2 .

It is a cyclic number.

It is not a de Polignac number, because 1273729 - 2³ = 1273721 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1273729.

It is not a weakly prime, because it can be changed into another prime (1273721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636864 + 636865.

It is an arithmetic number, because the mean of its divisors is an integer number (636865).

2^1273729 is an apocalyptic number.

It is an amenable number.

1273729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1273729 is an equidigital number, since it uses as much as digits as its factorization.

1273729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5292, while the sum is 31.

The square root of 1273729 is about 1128.5960304733. The cubic root of 1273729 is about 108.3991006311.

It can be divided in two parts, 1273 and 729, that added together give a palindrome (2002).

The spelling of 1273729 in words is "one million, two hundred seventy-three thousand, seven hundred twenty-nine".