1272989536 has 48 divisors (see below), whose sum is σ = 3084558624. Its totient is φ = 503599104.

The previous prime is 1272989513. The next prime is 1272989537. The reversal of 1272989536 is 6359892721.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272989537) 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 7 ways as a sum of consecutive naturals, for example, 215665 + ... + 221488.

It is an arithmetic number, because the mean of its divisors is an integer number (64261638).

Almost surely, 2^1272989536 is an apocalyptic number.

1272989536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1272989536 is an abundant number, since it is smaller than the sum of its proper divisors (1811569088).

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

1272989536 is a wasteful number, since it uses less digits than its factorization.

1272989536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437183 (or 437175 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 52.

The square root of 1272989536 is about 35678.9789091560. The cubic root of 1272989536 is about 1083.7811951996.

The spelling of 1272989536 in words is "one billion, two hundred seventy-two million, nine hundred eighty-nine thousand, five hundred thirty-six".