2123709 has 12 divisors (see below), whose sum is σ = 3294144. Its totient is φ = 1213464.

The previous prime is 2123707. The next prime is 2123731. The reversal of 2123709 is 9073212.

It is not a de Polignac number, because 2123709 - 2¹ = 2123707 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7077 + ... + 7370.

It is an arithmetic number, because the mean of its divisors is an integer number (274512).

2^2123709 is an apocalyptic number.

It is an amenable number.

2123709 is a deficient number, since it is larger than the sum of its proper divisors (1170435).

2123709 is a wasteful number, since it uses less digits than its factorization.

2123709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14464 (or 14457 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 2123709 is about 1457.2950970891. The cubic root of 2123709 is about 128.5380387722.

The spelling of 2123709 in words is "two million, one hundred twenty-three thousand, seven hundred nine".