1999932791 has 8 divisors (see below), whose sum is σ = 2067264000. Its totient is φ = 1932777720.

The previous prime is 1999932787. The next prime is 1999932797. The reversal of 1999932791 is 1972399991.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1999932791 - 2² = 1999932787 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1999932791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999932797) 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, 20741 + ... + 66558.

It is an arithmetic number, because the mean of its divisors is an integer number (258408000).

Almost surely, 2^1999932791 is an apocalyptic number.

1999932791 is a deficient number, since it is larger than the sum of its proper divisors (67331209).

1999932791 is an equidigital number, since it uses as much as digits as its factorization.

1999932791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88069.

The product of its digits is 2480058, while the sum is 59.

The square root of 1999932791 is about 44720.6081242194. The cubic root of 1999932791 is about 1259.9069367311.

The spelling of 1999932791 in words is "one billion, nine hundred ninety-nine million, nine hundred thirty-two thousand, seven hundred ninety-one".