7209989 has 4 divisors (see below), whose sum is σ = 7634124. Its totient is φ = 6785856.

The previous prime is 7209947. The next prime is 7210001. The reversal of 7209989 is 9899027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9899027 = 409 ⋅24203.

It can be written as a sum of positive squares in 2 ways, for example, as 6461764 + 748225 = 2542^2 + 865^2 .

It is not a de Polignac number, because 7209989 - 2¹² = 7205893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7209919) 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, 212042 + ... + 212075.

It is an arithmetic number, because the mean of its divisors is an integer number (1908531).

Almost surely, 2^7209989 is an apocalyptic number.

It is an amenable number.

7209989 is a deficient number, since it is larger than the sum of its proper divisors (424135).

7209989 is a wasteful number, since it uses less digits than its factorization.

7209989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424134.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 7209989 is about 2685.1422681117. The cubic root of 7209989 is about 193.1871344847.

The spelling of 7209989 in words is "seven million, two hundred nine thousand, nine hundred eighty-nine".