2181572 has 12 divisors (see below), whose sum is σ = 3864336. Its totient is φ = 1077480.

The previous prime is 2181551. The next prime is 2181577. The reversal of 2181572 is 2751812.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (2181577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2954 + ... + 3617.

It is an arithmetic number, because the mean of its divisors is an integer number (322028).

2^2181572 is an apocalyptic number.

It is an amenable number.

2181572 is a deficient number, since it is larger than the sum of its proper divisors (1682764).

2181572 is a wasteful number, since it uses less digits than its factorization.

2181572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6658 (or 6656 counting only the distinct ones).

The product of its digits is 1120, while the sum is 26.

The square root of 2181572 is about 1477.0145564618. The cubic root of 2181572 is about 129.6949851101.

The spelling of 2181572 in words is "two million, one hundred eighty-one thousand, five hundred seventy-two".