1679931978 has 8 divisors (see below), whose sum is σ = 3359863968. Its totient is φ = 559977324.

The previous prime is 1679931977. The next prime is 1679931989. The reversal of 1679931978 is 8791399761.

It is a sphenic number, since it is the product of 3 distinct primes.

1679931978 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1679931977) 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 3 ways as a sum of consecutive naturals, for example, 139994326 + ... + 139994337.

It is an arithmetic number, because the mean of its divisors is an integer number (419982996).

Almost surely, 2^1679931978 is an apocalyptic number.

1679931978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1679931978 is a wasteful number, since it uses less digits than its factorization.

1679931978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279988668.

The product of its digits is 5143824, while the sum is 60.

The square root of 1679931978 is about 40986.9732720044. The cubic root of 1679931978 is about 1188.7683459925.

The spelling of 1679931978 in words is "one billion, six hundred seventy-nine million, nine hundred thirty-one thousand, nine hundred seventy-eight".