1212731712 has 84 divisors (see below), whose sum is σ = 3494407540. Its totient is φ = 402112512.

The previous prime is 1212731701. The next prime is 1212731713. The reversal of 1212731712 is 2171372121.

It can be written as a sum of positive squares in 2 ways, for example, as 289544256 + 923187456 = 17016^2 + 30384^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212731713) 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, 105714 + ... + 116622.

Almost surely, 2^1212731712 is an apocalyptic number.

1212731712 is a gapful number since it is divisible by the number (12) 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 1212731712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1747203770).

1212731712 is an abundant number, since it is smaller than the sum of its proper divisors (2281675828).

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

1212731712 is a wasteful number, since it uses less digits than its factorization.

1212731712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11120 (or 11107 counting only the distinct ones).

The product of its digits is 1176, while the sum is 27.

The square root of 1212731712 is about 34824.2977244337. The cubic root of 1212731712 is about 1066.4035399580.

The spelling of 1212731712 in words is "one billion, two hundred twelve million, seven hundred thirty-one thousand, seven hundred twelve".