7129216 has 16 divisors (see below), whose sum is σ = 14202990. Its totient is φ = 3564544.

The previous prime is 7129211. The next prime is 7129217. The reversal of 7129216 is 6129217.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 3594816 + 3534400 = 1896^2 + 1880^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (7129211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27721 + ... + 27976.

Almost surely, 2^7129216 is an apocalyptic number.

It is an amenable number.

7129216 is a deficient number, since it is larger than the sum of its proper divisors (7073774).

7129216 is an equidigital number, since it uses as much as digits as its factorization.

7129216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55711 (or 55699 counting only the distinct ones).

The product of its digits is 1512, while the sum is 28.

The square root of 7129216 is about 2670.0591753742. The cubic root of 7129216 is about 192.4630029534.

Subtracting from 7129216 its reverse (6129217), we obtain a palindrome (999999).

The spelling of 7129216 in words is "seven million, one hundred twenty-nine thousand, two hundred sixteen".