7128049 has 4 divisors (see below), whose sum is σ = 7547364. Its totient is φ = 6708736.

The previous prime is 7128031. The next prime is 7128071. The reversal of 7128049 is 9408217.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2146225 + 4981824 = 1465^2 + 2232^2 .

It is a cyclic number.

It is not a de Polignac number, because 7128049 - 2¹⁹ = 6603761 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7128049.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7128749) 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 3 ways as a sum of consecutive naturals, for example, 209632 + ... + 209665.

It is an arithmetic number, because the mean of its divisors is an integer number (1886841).

Almost surely, 2^7128049 is an apocalyptic number.

It is an amenable number.

7128049 is a deficient number, since it is larger than the sum of its proper divisors (419315).

7128049 is a wasteful number, since it uses less digits than its factorization.

7128049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419314.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 7128049 is about 2669.8406319479. The cubic root of 7128049 is about 192.4525007897.

The spelling of 7128049 in words is "seven million, one hundred twenty-eight thousand, forty-nine".