1229997312 has 180 divisors, whose sum is σ = 3828575520. Its totient is φ = 392020992.

The previous prime is 1229997287. The next prime is 1229997313. The reversal of 1229997312 is 2137999221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229997313) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 475639 + ... + 478217.

It is an arithmetic number, because the mean of its divisors is an integer number (21269864).

Almost surely, 2^1229997312 is an apocalyptic number.

1229997312 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 1229997312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1914287760).

1229997312 is an abundant number, since it is smaller than the sum of its proper divisors (2598578208).

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

1229997312 is an equidigital number, since it uses as much as digits as its factorization.

1229997312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2630 (or 2607 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 1229997312 is about 35071.3175116077. The cubic root of 1229997312 is about 1071.4404891931.

The spelling of 1229997312 in words is "one billion, two hundred twenty-nine million, nine hundred ninety-seven thousand, three hundred twelve".