2172312 has 64 divisors (see below), whose sum is σ = 6156000. Its totient is φ = 709632.

The previous prime is 2172283. The next prime is 2172323. The reversal of 2172312 is 2132712.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19168 + ... + 19280.

2^2172312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2172312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3078000).

2172312 is an abundant number, since it is smaller than the sum of its proper divisors (3983688).

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

2172312 is a wasteful number, since it uses less digits than its factorization.

2172312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217 (or 207 counting only the distinct ones).

The product of its digits is 168, while the sum is 18.

The square root of 2172312 is about 1473.8765212866. The cubic root of 2172312 is about 129.5112217782.

The spelling of 2172312 in words is "two million, one hundred seventy-two thousand, three hundred twelve".