1213712328 has 16 divisors (see below), whose sum is σ = 3034280880. Its totient is φ = 404570768.

The previous prime is 1213712327. The next prime is 1213712329. The reversal of 1213712328 is 8232173121.

It is an interprime number because it is at equal distance from previous prime (1213712327) and next prime (1213712329).

It is a junction number, because it is equal to n+sod(n) for n = 1213712295 and 1213712304.

It is not an unprimeable number, because it can be changed into a prime (1213712327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25285650 + ... + 25285697.

It is an arithmetic number, because the mean of its divisors is an integer number (189642555).

Almost surely, 2^1213712328 is an apocalyptic number.

It is an amenable number.

1213712328 is an abundant number, since it is smaller than the sum of its proper divisors (1820568552).

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

1213712328 is a wasteful number, since it uses less digits than its factorization.

1213712328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50571356 (or 50571352 counting only the distinct ones).

The product of its digits is 4032, while the sum is 30.

The square root of 1213712328 is about 34838.3743593182. The cubic root of 1213712328 is about 1066.6908941546.

Adding to 1213712328 its reverse (8232173121), we get a palindrome (9445885449).

The spelling of 1213712328 in words is "one billion, two hundred thirteen million, seven hundred twelve thousand, three hundred twenty-eight".