2181772 has 6 divisors (see below), whose sum is σ = 3818108. Its totient is φ = 1090884.

The previous prime is 2181737. The next prime is 2181833. The reversal of 2181772 is 2771812.

It is a self number, because there is not a number n which added to its sum of digits gives 2181772.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272718 + ... + 272725.

2^2181772 is an apocalyptic number.

It is an amenable number.

2181772 is a deficient number, since it is larger than the sum of its proper divisors (1636336).

2181772 is a wasteful number, since it uses less digits than its factorization.

2181772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545447 (or 545445 counting only the distinct ones).

The product of its digits is 1568, while the sum is 28.

The square root of 2181772 is about 1477.0822590499. The cubic root of 2181772 is about 129.6989483386.

The spelling of 2181772 in words is "two million, one hundred eighty-one thousand, seven hundred seventy-two".