7321289 has 4 divisors (see below), whose sum is σ = 7706640. Its totient is φ = 6935940.

The previous prime is 7321277. The next prime is 7321319. The reversal of 7321289 is 9821237.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9821237 = 307 ⋅31991.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7321289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7321219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192647 + ... + 192684.

It is an arithmetic number, because the mean of its divisors is an integer number (1926660).

Almost surely, 2^7321289 is an apocalyptic number.

It is an amenable number.

7321289 is a deficient number, since it is larger than the sum of its proper divisors (385351).

7321289 is a wasteful number, since it uses less digits than its factorization.

7321289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385350.

The product of its digits is 6048, while the sum is 32.

The square root of 7321289 is about 2705.7880552623. The cubic root of 7321289 is about 194.1761340121.

The spelling of 7321289 in words is "seven million, three hundred twenty-one thousand, two hundred eighty-nine".