2106309 has 8 divisors (see below), whose sum is σ = 2816352. Its totient is φ = 1400240.

The previous prime is 2106301. The next prime is 2106311. The reversal of 2106309 is 9036012.

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

It is a cyclic number.

It is not a de Polignac number, because 2106309 - 2³ = 2106301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2106301) 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, 622 + ... + 2144.

It is an arithmetic number, because the mean of its divisors is an integer number (352044).

2^2106309 is an apocalyptic number.

It is an amenable number.

2106309 is a deficient number, since it is larger than the sum of its proper divisors (710043).

2106309 is a wasteful number, since it uses less digits than its factorization.

2106309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1987.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 2106309 is about 1451.3128539360. The cubic root of 2106309 is about 128.1860291450.

It can be divided in two parts, 2106 and 309, that added together give a triangular number (2415 = T₆₉).

The spelling of 2106309 in words is "two million, one hundred six thousand, three hundred nine".