2171286 has 40 divisors (see below), whose sum is σ = 5244624. Its totient is φ = 667440.

The previous prime is 2171261. The next prime is 2171293. The reversal of 2171286 is 6821712.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1591 + ... + 2621.

2^2171286 is an apocalyptic number.

2171286 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 2171286, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2622312).

2171286 is an abundant number, since it is smaller than the sum of its proper divisors (3073338).

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

2171286 is a wasteful number, since it uses less digits than its factorization.

2171286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058 (or 1049 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 2171286 is about 1473.5284184569. The cubic root of 2171286 is about 129.4908288452.

Adding to 2171286 its reverse (6821712), we get a palindrome (8992998).

The spelling of 2171286 in words is "two million, one hundred seventy-one thousand, two hundred eighty-six".