1320729 has 8 divisors (see below), whose sum is σ = 1837632. Its totient is φ = 842160.

The previous prime is 1320727. The next prime is 1320731. The reversal of 1320729 is 9270231.

It is an interprime number because it is at equal distance from previous prime (1320727) and next prime (1320731).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1320729 - 2¹ = 1320727 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1320699 and 1320708.

It is not an unprimeable number, because it can be changed into a prime (1320721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9502 + ... + 9639.

It is an arithmetic number, because the mean of its divisors is an integer number (229704).

2^1320729 is an apocalyptic number.

It is an amenable number.

1320729 is a deficient number, since it is larger than the sum of its proper divisors (516903).

1320729 is a wasteful number, since it uses less digits than its factorization.

1320729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19167.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 1320729 is about 1149.2297420446. The cubic root of 1320729 is about 109.7163213927.

The spelling of 1320729 in words is "one million, three hundred twenty thousand, seven hundred twenty-nine".