2161782 has 96 divisors (see below), whose sum is σ = 6019200. Its totient is φ = 571536.

The previous prime is 2161781. The next prime is 2161787. The reversal of 2161782 is 2871612.

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

2161782 is a modest number, since divided by 1782 gives 216 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161781) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50253 + ... + 50295.

It is an arithmetic number, because the mean of its divisors is an integer number (62700).

2^2161782 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2161782, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3009600).

2161782 is an abundant number, since it is smaller than the sum of its proper divisors (3857418).

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

2161782 is a wasteful number, since it uses less digits than its factorization.

2161782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87 (or 74 counting only the distinct ones).

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

The square root of 2161782 is about 1470.2999693940. The cubic root of 2161782 is about 129.3016198030.

The spelling of 2161782 in words is "two million, one hundred sixty-one thousand, seven hundred eighty-two".