1996891 has 4 divisors (see below), whose sum is σ = 2150512. Its totient is φ = 1843272.

The previous prime is 1996879. The next prime is 1996901. The reversal of 1996891 is 1986991.

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 1996891 - 2⁵ = 1996859 is a prime.

1996891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1996091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76791 + ... + 76816.

It is an arithmetic number, because the mean of its divisors is an integer number (537628).

2^1996891 is an apocalyptic number.

1996891 is a deficient number, since it is larger than the sum of its proper divisors (153621).

1996891 is a wasteful number, since it uses less digits than its factorization.

1996891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153620.

The product of its digits is 34992, while the sum is 43.

The square root of 1996891 is about 1413.1139373738. The cubic root of 1996891 is about 125.9267862227.

The spelling of 1996891 in words is "one million, nine hundred ninety-six thousand, eight hundred ninety-one".