1213230312 has 320 divisors, whose sum is σ = 4202668800. Its totient is φ = 319334400.

The previous prime is 1213230311. The next prime is 1213230323. The reversal of 1213230312 is 2130323121.

1213230312 is a `hidden beast` number, since 121 + 3 + 230 + 312 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213230311) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3025312 + ... + 3025712.

It is an arithmetic number, because the mean of its divisors is an integer number (13133340).

Almost surely, 2^1213230312 is an apocalyptic number.

1213230312 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 1213230312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2101334400).

1213230312 is an abundant number, since it is smaller than the sum of its proper divisors (2989438488).

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

1213230312 is a wasteful number, since it uses less digits than its factorization.

1213230312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478 (or 465 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1213230312 is about 34831.4557835299. The cubic root of 1213230312 is about 1066.5496662468.

Adding to 1213230312 its reverse (2130323121), we get a palindrome (3343553433).

The spelling of 1213230312 in words is "one billion, two hundred thirteen million, two hundred thirty thousand, three hundred twelve".