1979671218 has 64 divisors (see below), whose sum is σ = 4771200000. Its totient is φ = 534942144.

The previous prime is 1979671207. The next prime is 1979671229. The reversal of 1979671218 is 8121769791.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1979671207) and next prime (1979671229).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 564033 + ... + 567531.

It is an arithmetic number, because the mean of its divisors is an integer number (74550000).

Almost surely, 2^1979671218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1979671218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2385600000).

1979671218 is an abundant number, since it is smaller than the sum of its proper divisors (2791528782).

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

1979671218 is a wasteful number, since it uses less digits than its factorization.

1979671218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4239.

The product of its digits is 381024, while the sum is 51.

The square root of 1979671218 is about 44493.4963562092. The cubic root of 1979671218 is about 1255.6377277668.

The spelling of 1979671218 in words is "one billion, nine hundred seventy-nine million, six hundred seventy-one thousand, two hundred eighteen".