1988992791 has 12 divisors (see below), whose sum is σ = 2873617968. Its totient is φ = 1325705184.

The previous prime is 1988992783. The next prime is 1988992801. The reversal of 1988992791 is 1972998891.

It is not a de Polignac number, because 1988992791 - 2³ = 1988992783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988992721) 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 11 ways as a sum of consecutive naturals, for example, 24406 + ... + 67628.

It is an arithmetic number, because the mean of its divisors is an integer number (239468164).

Almost surely, 2^1988992791 is an apocalyptic number.

1988992791 is a deficient number, since it is larger than the sum of its proper divisors (884625177).

1988992791 is a wasteful number, since it uses less digits than its factorization.

1988992791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48342 (or 48339 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 63.

The square root of 1988992791 is about 44598.1254202461. The cubic root of 1988992791 is about 1257.6054275419.

The spelling of 1988992791 in words is "one billion, nine hundred eighty-eight million, nine hundred ninety-two thousand, seven hundred ninety-one".