7072209 has 6 divisors (see below), whose sum is σ = 10215426. Its totient is φ = 4714800.

The previous prime is 7072193. The next prime is 7072243. The reversal of 7072209 is 9022707.

It can be written as a sum of positive squares in only one way, i.e., 4601025 + 2471184 = 2145^2 + 1572^2 .

It is not a de Polignac number, because 7072209 - 2⁴ = 7072193 is a prime.

It is a super-3 number, since 3×7072209³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7072909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 392892 + ... + 392909.

It is an arithmetic number, because the mean of its divisors is an integer number (1702571).

Almost surely, 2^7072209 is an apocalyptic number.

It is an amenable number.

7072209 is a deficient number, since it is larger than the sum of its proper divisors (3143217).

7072209 is a wasteful number, since it uses less digits than its factorization.

7072209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785807 (or 785804 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 7072209 is about 2659.3625175970. The cubic root of 7072209 is about 191.9486353485.

It can be divided in two parts, 707 and 2209, that added together give a square (2916 = 54²).

The spelling of 7072209 in words is "seven million, seventy-two thousand, two hundred nine".