7129729 has 2 divisors, whose sum is σ = 7129730. Its totient is φ = 7129728.

The previous prime is 7129711. The next prime is 7129781. The reversal of 7129729 is 9279217.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4060225 + 3069504 = 2015^2 + 1752^2 .

It is a cyclic number.

It is not a de Polignac number, because 7129729 - 2⁷ = 7129601 is a prime.

It is a super-2 number, since 2×7129729² = 101666071226882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7129229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3564864 + 3564865.

It is an arithmetic number, because the mean of its divisors is an integer number (3564865).

Almost surely, 2^7129729 is an apocalyptic number.

It is an amenable number.

7129729 is a deficient number, since it is larger than the sum of its proper divisors (1).

7129729 is an equidigital number, since it uses as much as digits as its factorization.

7129729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15876, while the sum is 37.

The square root of 7129729 is about 2670.1552389327. The cubic root of 7129729 is about 192.4676192232.

The spelling of 7129729 in words is "seven million, one hundred twenty-nine thousand, seven hundred twenty-nine".