1979644009 has 8 divisors (see below), whose sum is σ = 2262972800. Its totient is φ = 1696445856.

The previous prime is 1979643983. The next prime is 1979644027. The reversal of 1979644009 is 9004469791.

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

It is not a de Polignac number, because 1979644009 - 2⁷ = 1979643881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1979644099) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2317 + ... + 62965.

It is an arithmetic number, because the mean of its divisors is an integer number (282871600).

Almost surely, 2^1979644009 is an apocalyptic number.

It is an amenable number.

1979644009 is a deficient number, since it is larger than the sum of its proper divisors (283328791).

1979644009 is an equidigital number, since it uses as much as digits as its factorization.

1979644009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65319.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 1979644009 is about 44493.1905913703. The cubic root of 1979644009 is about 1255.6319751611.

The spelling of 1979644009 in words is "one billion, nine hundred seventy-nine million, six hundred forty-four thousand, nine".