1979991288 has 48 divisors (see below), whose sum is σ = 5849976600. Its totient is φ = 599997120.

The previous prime is 1979991283. The next prime is 1979991289. The reversal of 1979991288 is 8821999791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979991283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1249203 + ... + 1250786.

Almost surely, 2^1979991288 is an apocalyptic number.

1979991288 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1979991288 is an abundant number, since it is smaller than the sum of its proper divisors (3869985312).

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

1979991288 is a wasteful number, since it uses less digits than its factorization.

1979991288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2500012 (or 2500005 counting only the distinct ones).

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

The square root of 1979991288 is about 44497.0930286463. The cubic root of 1979991288 is about 1255.7053939372.

The spelling of 1979991288 in words is "one billion, nine hundred seventy-nine million, nine hundred ninety-one thousand, two hundred eighty-eight".