1645916 has 6 divisors (see below), whose sum is σ = 2880360. Its totient is φ = 822956.

The previous prime is 1645909. The next prime is 1645927. The reversal of 1645916 is 6195461.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205736 + ... + 205743.

It is an arithmetic number, because the mean of its divisors is an integer number (480060).

2^1645916 is an apocalyptic number.

It is an amenable number.

1645916 is a deficient number, since it is larger than the sum of its proper divisors (1234444).

1645916 is a wasteful number, since it uses less digits than its factorization.

1645916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411483 (or 411481 counting only the distinct ones).

The product of its digits is 6480, while the sum is 32.

The square root of 1645916 is about 1282.9325781194. The cubic root of 1645916 is about 118.0690011066.

The spelling of 1645916 in words is "one million, six hundred forty-five thousand, nine hundred sixteen".