1721168 has 20 divisors (see below), whose sum is σ = 3372180. Its totient is φ = 850944.

The previous prime is 1721149. The next prime is 1721183. The reversal of 1721168 is 8611271.

It can be written as a sum of positive squares in 2 ways, for example, as 300304 + 1420864 = 548^2 + 1192^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 998 + ... + 2106.

It is an arithmetic number, because the mean of its divisors is an integer number (168609).

2^1721168 is an apocalyptic number.

It is an amenable number.

1721168 is a deficient number, since it is larger than the sum of its proper divisors (1651012).

1721168 is a wasteful number, since it uses less digits than its factorization.

1721168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1214 (or 1208 counting only the distinct ones).

The product of its digits is 672, while the sum is 26.

The square root of 1721168 is about 1311.9329251147. The cubic root of 1721168 is about 119.8416429692.

The spelling of 1721168 in words is "one million, seven hundred twenty-one thousand, one hundred sixty-eight".