1639883972 has 24 divisors (see below), whose sum is σ = 2930415096. Its totient is φ = 802787328.

The previous prime is 1639883957. The next prime is 1639883981. The reversal of 1639883972 is 2793889361.

It can be written as a sum of positive squares in 4 ways, for example, as 117635716 + 1522248256 = 10846^2 + 39016^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19508 + ... + 60500.

It is an arithmetic number, because the mean of its divisors is an integer number (122100629).

Almost surely, 2^1639883972 is an apocalyptic number.

It is an amenable number.

1639883972 is a deficient number, since it is larger than the sum of its proper divisors (1290531124).

1639883972 is a wasteful number, since it uses less digits than its factorization.

1639883972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41207 (or 41205 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 56.

The square root of 1639883972 is about 40495.4808836739. The cubic root of 1639883972 is about 1179.2458966126.

The spelling of 1639883972 in words is "one billion, six hundred thirty-nine million, eight hundred eighty-three thousand, nine hundred seventy-two".