1272843216 has 60 divisors (see below), whose sum is σ = 3658483972. Its totient is φ = 412812288.

The previous prime is 1272843211. The next prime is 1272843233. The reversal of 1272843216 is 6123482721.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1085043600 + 187799616 = 32940^2 + 13704^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272843211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 114121 + ... + 124776.

Almost surely, 2^1272843216 is an apocalyptic number.

1272843216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1272843216 is an abundant number, since it is smaller than the sum of its proper divisors (2385640756).

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

1272843216 is a wasteful number, since it uses less digits than its factorization.

1272843216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238948 (or 238939 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 1272843216 is about 35676.9283431183. The cubic root of 1272843216 is about 1083.7396696054.

The spelling of 1272843216 in words is "one billion, two hundred seventy-two million, eight hundred forty-three thousand, two hundred sixteen".