1991994 has 8 divisors (see below), whose sum is σ = 3984000. Its totient is φ = 663996.

The previous prime is 1991993. The next prime is 1991999. The reversal of 1991994 is 4991991.

It is a sphenic number, since it is the product of 3 distinct primes.

1991994 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1991993) 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, 165994 + ... + 166005.

It is an arithmetic number, because the mean of its divisors is an integer number (498000).

2^1991994 is an apocalyptic number.

1991994 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1991994 is a wasteful number, since it uses less digits than its factorization.

1991994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332004.

The product of its digits is 26244, while the sum is 42.

The square root of 1991994 is about 1411.3801755728. The cubic root of 1991994 is about 125.8237647018.

The spelling of 1991994 in words is "one million, nine hundred ninety-one thousand, nine hundred ninety-four".