1991830746 has 16 divisors (see below), whose sum is σ = 3988905408. Its totient is φ = 663069600.

The previous prime is 1991830741. The next prime is 1991830747. The reversal of 1991830746 is 6470381991.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1991830695 and 1991830704.

It is not an unprimeable number, because it can be changed into a prime (1991830741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213550 + ... + 222681.

It is an arithmetic number, because the mean of its divisors is an integer number (249306588).

Almost surely, 2^1991830746 is an apocalyptic number.

1991830746 is an abundant number, since it is smaller than the sum of its proper divisors (1997074662).

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

1991830746 is a wasteful number, since it uses less digits than its factorization.

1991830746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436997.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 1991830746 is about 44629.9310552907. The cubic root of 1991830746 is about 1258.2032730957.

The spelling of 1991830746 in words is "one billion, nine hundred ninety-one million, eight hundred thirty thousand, seven hundred forty-six".