2131206 has 48 divisors (see below), whose sum is σ = 5417280. Its totient is φ = 552720.

The previous prime is 2131193. The next prime is 2131223. The reversal of 2131206 is 6021312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2905 + ... + 3563.

It is an arithmetic number, because the mean of its divisors is an integer number (112860).

2^2131206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2131206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2708640).

2131206 is an abundant number, since it is smaller than the sum of its proper divisors (3286074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2131206 is a wasteful number, since it uses less digits than its factorization.

2131206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689 (or 682 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 2131206 is about 1459.8650622575. The cubic root of 2131206 is about 128.6891137632.

Adding to 2131206 its reverse (6021312), we get a palindrome (8152518).

The spelling of 2131206 in words is "two million, one hundred thirty-one thousand, two hundred six".