1213712320 has 56 divisors (see below), whose sum is σ = 2925037584. Its totient is φ = 479625216.

The previous prime is 1213712273. The next prime is 1213712327. The reversal of 1213712320 is 232173121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1213712291 and 1213712300.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 3712 + ... + 49408.

It is an arithmetic number, because the mean of its divisors is an integer number (52232814).

Almost surely, 2^1213712320 is an apocalyptic number.

1213712320 is a gapful number since it is divisible by the number (10) 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 1213712320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1462518792).

1213712320 is an abundant number, since it is smaller than the sum of its proper divisors (1711325264).

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

1213712320 is an equidigital number, since it uses as much as digits as its factorization.

1213712320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45797 (or 45787 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 1213712320 is about 34838.3742445023. The cubic root of 1213712320 is about 1066.6908918109.

Adding to 1213712320 its reverse (232173121), we get a palindrome (1445885441).

The spelling of 1213712320 in words is "one billion, two hundred thirteen million, seven hundred twelve thousand, three hundred twenty".