1979247688 has 128 divisors (see below), whose sum is σ = 4311014400. Its totient is φ = 843897600.

The previous prime is 1979247671. The next prime is 1979247701. The reversal of 1979247688 is 8867429791.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14239123 + ... + 14239261.

It is an arithmetic number, because the mean of its divisors is an integer number (33679800).

Almost surely, 2^1979247688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1979247688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2155507200).

1979247688 is an abundant number, since it is smaller than the sum of its proper divisors (2331766712).

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

1979247688 is a wasteful number, since it uses less digits than its factorization.

1979247688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323 (or 319 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 61.

The square root of 1979247688 is about 44488.7366419861. The cubic root of 1979247688 is about 1255.5481778504.

The spelling of 1979247688 in words is "one billion, nine hundred seventy-nine million, two hundred forty-seven thousand, six hundred eighty-eight".