2102709 has 8 divisors (see below), whose sum is σ = 3204160. Its totient is φ = 1201536.

The previous prime is 2102693. The next prime is 2102717. The reversal of 2102709 is 9072012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2102709 - 2⁴ = 2102693 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 100129 = 2102709 / (2 + 1 + 0 + 2 + 7 + 0 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102759) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50044 + ... + 50085.

It is an arithmetic number, because the mean of its divisors is an integer number (400520).

2^2102709 is an apocalyptic number.

It is an amenable number.

2102709 is a deficient number, since it is larger than the sum of its proper divisors (1101451).

2102709 is a wasteful number, since it uses less digits than its factorization.

2102709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100139.

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

The square root of 2102709 is about 1450.0720671746. The cubic root of 2102709 is about 128.1129577419.

The spelling of 2102709 in words is "two million, one hundred two thousand, seven hundred nine".