1891996 has 12 divisors (see below), whose sum is σ = 3323320. Its totient is φ = 942480.

The previous prime is 1891991. The next prime is 1891997. The reversal of 1891996 is 6991981.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1891991) 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, 610 + ... + 2038.

2^1891996 is an apocalyptic number.

It is an amenable number.

1891996 is a deficient number, since it is larger than the sum of its proper divisors (1431324).

1891996 is a wasteful number, since it uses less digits than its factorization.

1891996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1764 (or 1762 counting only the distinct ones).

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

The square root of 1891996 is about 1375.4984551064. The cubic root of 1891996 is about 123.6820679432.

The spelling of 1891996 in words is "one million, eight hundred ninety-one thousand, nine hundred ninety-six".