1272239616 has 80 divisors (see below), whose sum is σ = 3461635584. Its totient is φ = 415033344.

The previous prime is 1272239587. The next prime is 1272239627. The reversal of 1272239616 is 6169322721.

It is a congruent number.

It is an unprimeable number.

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, 63381 + ... + 81003.

Almost surely, 2^1272239616 is an apocalyptic number.

1272239616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1272239616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1730817792).

1272239616 is an abundant number, since it is smaller than the sum of its proper divisors (2189395968).

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

1272239616 is an equidigital number, since it uses as much as digits as its factorization.

1272239616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17691 (or 17675 counting only the distinct ones).

The product of its digits is 54432, while the sum is 39.

The square root of 1272239616 is about 35668.4680915792. The cubic root of 1272239616 is about 1083.5683343654.

The spelling of 1272239616 in words is "one billion, two hundred seventy-two million, two hundred thirty-nine thousand, six hundred sixteen".