7120729 has 18 divisors (see below), whose sum is σ = 9112362. Its totient is φ = 5544000.

The previous prime is 7120727. The next prime is 7120733. The reversal of 7120729 is 9270217.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 3705625 + 3415104 = 1925^2 + 1848^2 .

It is not a de Polignac number, because 7120729 - 2¹ = 7120727 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7120697 and 7120706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7120723) 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 17 ways as a sum of consecutive naturals, for example, 5329 + ... + 6529.

Almost surely, 2^7120729 is an apocalyptic number.

It is an amenable number.

7120729 is a deficient number, since it is larger than the sum of its proper divisors (1991633).

7120729 is a wasteful number, since it uses less digits than its factorization.

7120729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237 (or 1219 counting only the distinct ones).

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

The square root of 7120729 is about 2668.4694114792. The cubic root of 7120729 is about 192.3865998767.

The spelling of 7120729 in words is "seven million, one hundred twenty thousand, seven hundred twenty-nine".