1988916979 has 16 divisors (see below), whose sum is σ = 2397358080. Its totient is φ = 1611904320.

The previous prime is 1988916961. The next prime is 1988917009. The reversal of 1988916979 is 9796198891.

It is a cyclic number.

It is not a de Polignac number, because 1988916979 - 2²⁵ = 1955362547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1988916949) 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 15 ways as a sum of consecutive naturals, for example, 54942 + ... + 83644.

It is an arithmetic number, because the mean of its divisors is an integer number (149834880).

Almost surely, 2^1988916979 is an apocalyptic number.

1988916979 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1988916979 is a deficient number, since it is larger than the sum of its proper divisors (408441101).

1988916979 is a wasteful number, since it uses less digits than its factorization.

1988916979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29250.

The product of its digits is 17635968, while the sum is 67.

The square root of 1988916979 is about 44597.2754661089. The cubic root of 1988916979 is about 1257.5894491374.

The spelling of 1988916979 in words is "one billion, nine hundred eighty-eight million, nine hundred sixteen thousand, nine hundred seventy-nine".