1996945 has 4 divisors (see below), whose sum is σ = 2396340. Its totient is φ = 1597552.

The previous prime is 1996937. The next prime is 1996949. The reversal of 1996945 is 5496991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5496991 = 43 ⋅127837.

It can be written as a sum of positive squares in 2 ways, for example, as 576081 + 1420864 = 759^2 + 1192^2 .

It is a cyclic number.

It is not a de Polignac number, because 1996945 - 2³ = 1996937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1996949) 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, 199690 + ... + 199699.

It is an arithmetic number, because the mean of its divisors is an integer number (599085).

2^1996945 is an apocalyptic number.

It is an amenable number.

1996945 is a deficient number, since it is larger than the sum of its proper divisors (399395).

1996945 is an equidigital number, since it uses as much as digits as its factorization.

1996945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399394.

The product of its digits is 87480, while the sum is 43.

The square root of 1996945 is about 1413.1330439842. The cubic root of 1996945 is about 125.9279213181.

The spelling of 1996945 in words is "one million, nine hundred ninety-six thousand, nine hundred forty-five".