1645996 has 12 divisors (see below), whose sum is σ = 3142440. Its totient is φ = 748160.

The previous prime is 1645979. The next prime is 1645999. The reversal of 1645996 is 6995461.

It is not an unprimeable number, because it can be changed into a prime (1645999) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 18661 + ... + 18748.

It is an arithmetic number, because the mean of its divisors is an integer number (261870).

2^1645996 is an apocalyptic number.

It is an amenable number.

1645996 is a deficient number, since it is larger than the sum of its proper divisors (1496444).

1645996 is a wasteful number, since it uses less digits than its factorization.

1645996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37424 (or 37422 counting only the distinct ones).

The product of its digits is 58320, while the sum is 40.

The square root of 1645996 is about 1282.9637563080. The cubic root of 1645996 is about 118.0709139962.

The spelling of 1645996 in words is "one million, six hundred forty-five thousand, nine hundred ninety-six".