1999997783 has 8 divisors (see below), whose sum is σ = 2293515168. Its totient is φ = 1708431264.

The previous prime is 1999997777. The next prime is 1999997807. The reversal of 1999997783 is 3877999991.

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 1999997783 - 2⁶ = 1999997719 is a prime.

It is a super-2 number, since 2×1999997783² = 7999982264009830178, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999997773) 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, 485516 + ... + 489617.

It is an arithmetic number, because the mean of its divisors is an integer number (286689396).

Almost surely, 2^1999997783 is an apocalyptic number.

1999997783 is a deficient number, since it is larger than the sum of its proper divisors (293517385).

1999997783 is an equidigital number, since it uses as much as digits as its factorization.

1999997783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975433.

The product of its digits is 69441624, while the sum is 71.

The square root of 1999997783 is about 44721.3347631754. The cubic root of 1999997783 is about 1259.9205843539.

The spelling of 1999997783 in words is "one billion, nine hundred ninety-nine million, nine hundred ninety-seven thousand, seven hundred eighty-three".