7209889 has 2 divisors, whose sum is σ = 7209890. Its totient is φ = 7209888.

The previous prime is 7209877. The next prime is 7209919. The reversal of 7209889 is 9889027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5499025 + 1710864 = 2345^2 + 1308^2 .

It is a cyclic number.

It is not a de Polignac number, because 7209889 - 2¹³ = 7201697 is a prime.

It is equal to p₄₈₉₉₄₉ and since 7209889 and 489949 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (7209589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3604944 + 3604945.

It is an arithmetic number, because the mean of its divisors is an integer number (3604945).

Almost surely, 2^7209889 is an apocalyptic number.

It is an amenable number.

7209889 is a deficient number, since it is larger than the sum of its proper divisors (1).

7209889 is an equidigital number, since it uses as much as digits as its factorization.

7209889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 7209889 is about 2685.1236470599. The cubic root of 7209889 is about 193.1862413348.

It can be divided in two parts, 720 and 9889, that added together give a square (10609 = 103²).

The spelling of 7209889 in words is "seven million, two hundred nine thousand, eight hundred eighty-nine".