7220289 has 4 divisors (see below), whose sum is σ = 9627056. Its totient is φ = 4813524.

The previous prime is 7220263. The next prime is 7220299. The reversal of 7220289 is 9820227.

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.

It is not a de Polignac number, because 7220289 - 2⁸ = 7220033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7220219) 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, 1203379 + ... + 1203384.

It is an arithmetic number, because the mean of its divisors is an integer number (2406764).

Almost surely, 2^7220289 is an apocalyptic number.

It is an amenable number.

7220289 is a deficient number, since it is larger than the sum of its proper divisors (2406767).

7220289 is a wasteful number, since it uses less digits than its factorization.

7220289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2406766.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 7220289 is about 2687.0595453023. The cubic root of 7220289 is about 193.2790847266.

The spelling of 7220289 in words is "seven million, two hundred twenty thousand, two hundred eighty-nine".