1645168 has 40 divisors (see below), whose sum is σ = 3750752. Its totient is φ = 684288.

The previous prime is 1645157. The next prime is 1645169. The reversal of 1645168 is 8615461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3946 + ... + 4342.

2^1645168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1645168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1875376).

1645168 is an abundant number, since it is smaller than the sum of its proper divisors (2105584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1645168 is a wasteful number, since it uses less digits than its factorization.

1645168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449 (or 443 counting only the distinct ones).

The product of its digits is 5760, while the sum is 31.

The square root of 1645168 is about 1282.6410253847. The cubic root of 1645168 is about 118.0511125884.

The spelling of 1645168 in words is "one million, six hundred forty-five thousand, one hundred sixty-eight".