7200009 has 20 divisors (see below), whose sum is σ = 10872576. Its totient is φ = 4747896.

The previous prime is 7200007. The next prime is 7200023. The reversal of 7200009 is 9000027.

It is not a de Polignac number, because 7200009 - 2¹ = 7200007 is a prime.

It is a Curzon number.

7200009 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 7199964 and 7200000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7200007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7912 + ... + 8774.

Almost surely, 2^7200009 is an apocalyptic number.

It is an amenable number.

7200009 is a deficient number, since it is larger than the sum of its proper divisors (3672567).

7200009 is a wasteful number, since it uses less digits than its factorization.

7200009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978 (or 969 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 18.

The square root of 7200009 is about 2683.2832500502. The cubic root of 7200009 is about 193.0979573785.

Adding to 7200009 its sum of digits (18), we get a palindrome (7200027).

The spelling of 7200009 in words is "seven million, two hundred thousand, nine".