2197709 has 4 divisors (see below), whose sum is σ = 2327004. Its totient is φ = 2068416.

The previous prime is 2197703. The next prime is 2197733. The reversal of 2197709 is 9077912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1562500 + 635209 = 1250^2 + 797^2 .

It is a cyclic number.

It is not a de Polignac number, because 2197709 - 2⁴ = 2197693 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 (2197703) 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, 64622 + ... + 64655.

It is an arithmetic number, because the mean of its divisors is an integer number (581751).

2^2197709 is an apocalyptic number.

It is an amenable number.

2197709 is a deficient number, since it is larger than the sum of its proper divisors (129295).

2197709 is a wasteful number, since it uses less digits than its factorization.

2197709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129294.

The product of its (nonzero) digits is 7938, while the sum is 35.

The square root of 2197709 is about 1482.4672003117. The cubic root of 2197709 is about 130.0139827169.

The spelling of 2197709 in words is "two million, one hundred ninety-seven thousand, seven hundred nine".