1272039984 has 40 divisors (see below), whose sum is σ = 3651227120. Its totient is φ = 424013184.

The previous prime is 1272039917. The next prime is 1272039991. The reversal of 1272039984 is 4899302721.

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, 1471837 + ... + 1472700.

It is an arithmetic number, because the mean of its divisors is an integer number (91280678).

Almost surely, 2^1272039984 is an apocalyptic number.

It is an amenable number.

1272039984 is an abundant number, since it is smaller than the sum of its proper divisors (2379187136).

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

1272039984 is a wasteful number, since it uses less digits than its factorization.

1272039984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2944554 (or 2944542 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 1272039984 is about 35665.6695436943. The cubic root of 1272039984 is about 1083.5116557790.

The spelling of 1272039984 in words is "one billion, two hundred seventy-two million, thirty-nine thousand, nine hundred eighty-four".