1072729 has 4 divisors (see below), whose sum is σ = 1225984. Its totient is φ = 919476.

The previous prime is 1072711. The next prime is 1072733. The reversal of 1072729 is 9272701.

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 a cyclic number.

It is not a de Polignac number, because 1072729 - 2¹¹ = 1070681 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1072697 and 1072706.

It is not an unprimeable number, because it can be changed into a prime (1072129) 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, 76617 + ... + 76630.

It is an arithmetic number, because the mean of its divisors is an integer number (306496).

2^1072729 is an apocalyptic number.

It is an amenable number.

1072729 is a deficient number, since it is larger than the sum of its proper divisors (153255).

1072729 is an equidigital number, since it uses as much as digits as its factorization.

1072729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153254.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 1072729 is about 1035.7263152011. The cubic root of 1072729 is about 102.3677930634.

Subtracting from 1072729 its sum of digits (28), we obtain a palindrome (1072701).

The spelling of 1072729 in words is "one million, seventy-two thousand, seven hundred twenty-nine".