1243729 has 4 divisors (see below), whose sum is σ = 1264180. Its totient is φ = 1223280.

The previous prime is 1243717. The next prime is 1243741. The reversal of 1243729 is 9273421.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1243717) and next prime (1243741).

It can be written as a sum of positive squares in 2 ways, for example, as 603729 + 640000 = 777^2 + 800^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243729 - 2¹⁹ = 719441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1243697 and 1243706.

It is not an unprimeable number, because it can be changed into a prime (1243709) 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 in 3 ways as a sum of consecutive naturals, for example, 10134 + ... + 10255.

It is an arithmetic number, because the mean of its divisors is an integer number (316045).

2^1243729 is an apocalyptic number.

It is an amenable number.

1243729 is a deficient number, since it is larger than the sum of its proper divisors (20451).

1243729 is an equidigital number, since it uses as much as digits as its factorization.

1243729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20450.

The product of its digits is 3024, while the sum is 28.

The square root of 1243729 is about 1115.2259860674. The cubic root of 1243729 is about 107.5412929521.

The spelling of 1243729 in words is "one million, two hundred forty-three thousand, seven hundred twenty-nine".