1645968 has 40 divisors (see below), whose sum is σ = 4339008. Its totient is φ = 537472.

The previous prime is 1645967. The next prime is 1645979. The reversal of 1645968 is 8695461.

It is not an unprimeable number, because it can be changed into a prime (1645961) 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, 2221 + ... + 2867.

2^1645968 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 1645968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2169504).

1645968 is an abundant number, since it is smaller than the sum of its proper divisors (2693040).

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

1645968 is a wasteful number, since it uses less digits than its factorization.

1645968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711 (or 705 counting only the distinct ones).

The product of its digits is 51840, while the sum is 39.

The square root of 1645968 is about 1282.9528440282. The cubic root of 1645968 is about 118.0702444919.

The spelling of 1645968 in words is "one million, six hundred forty-five thousand, nine hundred sixty-eight".