1200729 has 4 divisors (see below), whose sum is σ = 1600976. Its totient is φ = 800484.

The previous prime is 1200701. The next prime is 1200739. The reversal of 1200729 is 9270021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1200729 - 2⁵ = 1200697 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1200739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200119 + ... + 200124.

It is an arithmetic number, because the mean of its divisors is an integer number (400244).

2^1200729 is an apocalyptic number.

It is an amenable number.

1200729 is a deficient number, since it is larger than the sum of its proper divisors (400247).

1200729 is an equidigital number, since it uses as much as digits as its factorization.

1200729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400246.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 1200729 is about 1095.7778059443. Note that the first 3 decimals coincide. The cubic root of 1200729 is about 106.2873713982.

The spelling of 1200729 in words is "one million, two hundred thousand, seven hundred twenty-nine".