2102409 has 8 divisors (see below), whose sum is σ = 3114720. Its totient is φ = 1401588.

The previous prime is 2102383. The next prime is 2102411. The reversal of 2102409 is 9042012.

It is a de Polignac number, because none of the positive numbers 2^k-2102409 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2102391 and 2102400.

It is not an unprimeable number, because it can be changed into a prime (2102459) 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, 38907 + ... + 38960.

It is an arithmetic number, because the mean of its divisors is an integer number (389340).

2^2102409 is an apocalyptic number.

It is an amenable number.

2102409 is a deficient number, since it is larger than the sum of its proper divisors (1012311).

2102409 is an equidigital number, since it uses as much as digits as its factorization.

2102409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77876 (or 77870 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 2102409 is about 1449.9686203501. The cubic root of 2102409 is about 128.1068646947.

The spelling of 2102409 in words is "two million, one hundred two thousand, four hundred nine".