1768221 has 48 divisors (see below), whose sum is σ = 3354624. Its totient is φ = 870912.

The previous prime is 1768199. The next prime is 1768223. The reversal of 1768221 is 1228671.

It is not a de Polignac number, because 1768221 - 2⁶ = 1768157 is a prime.

It is an Ulam number.

It is a Curzon number.

1768221 is a lucky number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1768223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13860 + ... + 13986.

It is an arithmetic number, because the mean of its divisors is an integer number (69888).

2^1768221 is an apocalyptic number.

It is an amenable number.

1768221 is a deficient number, since it is larger than the sum of its proper divisors (1586403).

1768221 is a wasteful number, since it uses less digits than its factorization.

1768221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 167 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 1768221 is about 1329.7447123414. The cubic root of 1768221 is about 120.9239099967.

The spelling of 1768221 in words is "one million, seven hundred sixty-eight thousand, two hundred twenty-one".