1213513776 has 60 divisors (see below), whose sum is σ = 3414989760. Its totient is φ = 402261120.

The previous prime is 1213513751. The next prime is 1213513781. The reversal of 1213513776 is 6773153121.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1213513776.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2785 + ... + 49343.

It is an arithmetic number, because the mean of its divisors is an integer number (56916496).

Almost surely, 2^1213513776 is an apocalyptic number.

1213513776 is a gapful number since it is divisible by the number (16) 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 1213513776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1707494880).

1213513776 is an abundant number, since it is smaller than the sum of its proper divisors (2201475984).

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

1213513776 is a wasteful number, since it uses less digits than its factorization.

1213513776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46754 (or 46745 counting only the distinct ones).

The product of its digits is 26460, while the sum is 36.

The square root of 1213513776 is about 34835.5246264499. The cubic root of 1213513776 is about 1066.6327240935.

Adding to 1213513776 its reverse (6773153121), we get a palindrome (7986666897).

The spelling of 1213513776 in words is "one billion, two hundred thirteen million, five hundred thirteen thousand, seven hundred seventy-six".