2173988 has 6 divisors (see below), whose sum is σ = 3804486. Its totient is φ = 1086992.

The previous prime is 2173981. The next prime is 2173993. The reversal of 2173988 is 8893712.

2173988 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2096704 + 77284 = 1448^2 + 278^2 .

It is not an unprimeable number, because it can be changed into a prime (2173981) 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 as a sum of consecutive naturals, namely, 271745 + ... + 271752.

It is an arithmetic number, because the mean of its divisors is an integer number (634081).

2^2173988 is an apocalyptic number.

It is an amenable number.

2173988 is a deficient number, since it is larger than the sum of its proper divisors (1630498).

2173988 is a wasteful number, since it uses less digits than its factorization.

2173988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543501 (or 543499 counting only the distinct ones).

The product of its digits is 24192, while the sum is 38.

The square root of 2173988 is about 1474.4449803231. Note that the first 3 decimals coincide. The cubic root of 2173988 is about 129.5445204033.

The spelling of 2173988 in words is "two million, one hundred seventy-three thousand, nine hundred eighty-eight".