7128849 has 16 divisors (see below), whose sum is σ = 11699072. Its totient is φ = 3760128.

The previous prime is 7128833. The next prime is 7128907. The reversal of 7128849 is 9488217.

It is not a de Polignac number, because 7128849 - 2⁴ = 7128833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an Ulam 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 (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12784 + ... + 13329.

It is an arithmetic number, because the mean of its divisors is an integer number (731192).

Almost surely, 2^7128849 is an apocalyptic number.

It is an amenable number.

7128849 is a deficient number, since it is larger than the sum of its proper divisors (4570223).

7128849 is a wasteful number, since it uses less digits than its factorization.

7128849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26136.

The product of its digits is 32256, while the sum is 39.

The square root of 7128849 is about 2669.9904494211. The cubic root of 7128849 is about 192.4597003400.

It can be divided in two parts, 71 and 28849, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 7128849 in words is "seven million, one hundred twenty-eight thousand, eight hundred forty-nine".