7272729 has 6 divisors (see below), whose sum is σ = 10505066. Its totient is φ = 4848480.

The previous prime is 7272721. The next prime is 7272737. The reversal of 7272729 is 9272727.

It is an interprime number because it is at equal distance from previous prime (7272721) and next prime (7272737).

It can be written as a sum of positive squares in only one way, i.e., 7209225 + 63504 = 2685^2 + 252^2 .

It is not a de Polignac number, because 7272729 - 2³ = 7272721 is a prime.

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

It is a Duffinian number.

It is a Curzon number.

7272729 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 7272693 and 7272702.

It is not an unprimeable number, because it can be changed into a prime (7272721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 404032 + ... + 404049.

Almost surely, 2^7272729 is an apocalyptic number.

It is an amenable number.

7272729 is a deficient number, since it is larger than the sum of its proper divisors (3232337).

7272729 is a wasteful number, since it uses less digits than its factorization.

7272729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808087 (or 808084 counting only the distinct ones).

The product of its digits is 24696, while the sum is 36.

The square root of 7272729 is about 2696.7997700979. The cubic root of 7272729 is about 193.7458765685.

It can be divided in two parts, 7272 and 729, that added together give a triangular number (8001 = T₁₂₆).

The spelling of 7272729 in words is "seven million, two hundred seventy-two thousand, seven hundred twenty-nine".