7212009 has 16 divisors (see below), whose sum is σ = 11225088. Its totient is φ = 4032912.

The previous prime is 7211993. The next prime is 7212011. The reversal of 7212009 is 9002127.

It is a happy number.

It is not a de Polignac number, because 7212009 - 2⁴ = 7211993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (7212019) 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 15 ways as a sum of consecutive naturals, for example, 2667 + ... + 4640.

It is an arithmetic number, because the mean of its divisors is an integer number (701568).

Almost surely, 2^7212009 is an apocalyptic number.

It is an amenable number.

7212009 is a deficient number, since it is larger than the sum of its proper divisors (4013079).

7212009 is a wasteful number, since it uses less digits than its factorization.

7212009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7364.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 7212009 is about 2685.5183857125. The cubic root of 7212009 is about 193.2051743446.

The spelling of 7212009 in words is "seven million, two hundred twelve thousand, nine".