1979987508 has 36 divisors (see below), whose sum is σ = 5075467488. Its totient is φ = 650699280.

The previous prime is 1979987491. The next prime is 1979987509. The reversal of 1979987508 is 8057899791.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979987509) 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, 384766 + ... + 389877.

It is an arithmetic number, because the mean of its divisors is an integer number (140985208).

Almost surely, 2^1979987508 is an apocalyptic number.

1979987508 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1979987508 is an abundant number, since it is smaller than the sum of its proper divisors (3095479980).

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

1979987508 is a wasteful number, since it uses less digits than its factorization.

1979987508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774724 (or 774719 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 63.

The square root of 1979987508 is about 44497.0505539412. The cubic root of 1979987508 is about 1255.7045948480.

The spelling of 1979987508 in words is "one billion, nine hundred seventy-nine million, nine hundred eighty-seven thousand, five hundred eight".