2181172 has 12 divisors (see below), whose sum is σ = 4362400. Its totient is φ = 934776.

The previous prime is 2181169. The next prime is 2181173. The reversal of 2181172 is 2711812.

2181172 is an admirable number.

It is a super-2 number, since 2×2181172² = 9515022587168, which contains 22 as substring.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38922 + ... + 38977.

2^2181172 is an apocalyptic number.

It is an amenable number.

2181172 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2181172 is a wasteful number, since it uses less digits than its factorization.

2181172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77910 (or 77908 counting only the distinct ones).

The product of its digits is 224, while the sum is 22.

The square root of 2181172 is about 1476.8791419747. The cubic root of 2181172 is about 129.6870579266.

Adding to 2181172 its reverse (2711812), we get a palindrome (4892984).

The spelling of 2181172 in words is "two million, one hundred eighty-one thousand, one hundred seventy-two".