2731209 has 12 divisors (see below), whose sum is σ = 3944016. Its totient is φ = 1680432.

The previous prime is 2731207. The next prime is 2731241. The reversal of 2731209 is 9021372.

2731209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2731209 - 2¹ = 2731207 is a prime.

2731209 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2731207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2187 + ... + 3200.

It is an arithmetic number, because the mean of its divisors is an integer number (328668).

2^2731209 is an apocalyptic number.

It is an amenable number.

2731209 is a deficient number, since it is larger than the sum of its proper divisors (1212807).

2731209 is a wasteful number, since it uses less digits than its factorization.

2731209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5416 (or 5403 counting only the distinct ones).

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

The square root of 2731209 is about 1652.6369837324. The cubic root of 2731209 is about 139.7821271009.

The spelling of 2731209 in words is "two million, seven hundred thirty-one thousand, two hundred nine".