7212729 has 8 divisors (see below), whose sum is σ = 9690912. Its totient is φ = 4771520.

The previous prime is 7212727. The next prime is 7212757. The reversal of 7212729 is 9272127.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 7212729 - 2¹ = 7212727 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 7212696 and 7212705.

It is not an unprimeable number, because it can be changed into a prime (7212721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8784 + ... + 9569.

It is an arithmetic number, because the mean of its divisors is an integer number (1211364).

Almost surely, 2^7212729 is an apocalyptic number.

It is an amenable number.

7212729 is a deficient number, since it is larger than the sum of its proper divisors (2478183).

7212729 is a wasteful number, since it uses less digits than its factorization.

7212729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18487.

The product of its digits is 3528, while the sum is 30.

The square root of 7212729 is about 2685.6524346981. The cubic root of 7212729 is about 193.2116035793.

The spelling of 7212729 in words is "seven million, two hundred twelve thousand, seven hundred twenty-nine".