1996647 has 4 divisors (see below), whose sum is σ = 2662200. Its totient is φ = 1331096.

The previous prime is 1996639. The next prime is 1996649. The reversal of 1996647 is 7466991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1996647 - 2³ = 1996639 is a prime.

It is a D-number.

1996647 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1996599 and 1996608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1996649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332772 + ... + 332777.

It is an arithmetic number, because the mean of its divisors is an integer number (665550).

2^1996647 is an apocalyptic number.

1996647 is a deficient number, since it is larger than the sum of its proper divisors (665553).

1996647 is an equidigital number, since it uses as much as digits as its factorization.

1996647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665552.

The product of its digits is 81648, while the sum is 42.

The square root of 1996647 is about 1413.0276005797. The cubic root of 1996647 is about 125.9216570181.

The spelling of 1996647 in words is "one million, nine hundred ninety-six thousand, six hundred forty-seven".