1996691 has 6 divisors (see below), whose sum is σ = 2107692. Its totient is φ = 1891260.

The previous prime is 1996681. The next prime is 1996697. The reversal of 1996691 is 1966991.

It is not a de Polignac number, because 1996691 - 2¹⁸ = 1734547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1996697) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2405 + ... + 3126.

It is an arithmetic number, because the mean of its divisors is an integer number (351282).

2^1996691 is an apocalyptic number.

1996691 is a deficient number, since it is larger than the sum of its proper divisors (111001).

1996691 is an equidigital number, since it uses as much as digits as its factorization.

1996691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5569 (or 5550 counting only the distinct ones).

The product of its digits is 26244, while the sum is 41.

The square root of 1996691 is about 1413.0431698996. The cubic root of 1996691 is about 125.9225819875.

The spelling of 1996691 in words is "one million, nine hundred ninety-six thousand, six hundred ninety-one".