1213260820 has 48 divisors (see below), whose sum is σ = 2691843840. Its totient is φ = 458589824.

The previous prime is 1213260707. The next prime is 1213260847. The reversal of 1213260820 is 280623121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5007 + ... + 49513.

It is an arithmetic number, because the mean of its divisors is an integer number (56080080).

Almost surely, 2^1213260820 is an apocalyptic number.

1213260820 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 1213260820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1345921920).

1213260820 is an abundant number, since it is smaller than the sum of its proper divisors (1478583020).

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

1213260820 is a wasteful number, since it uses less digits than its factorization.

1213260820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44592 (or 44590 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1213260820 is about 34831.8937182577. The cubic root of 1213260820 is about 1066.5586060236.

Adding to 1213260820 its reverse (280623121), we get a palindrome (1493883941).

The spelling of 1213260820 in words is "one billion, two hundred thirteen million, two hundred sixty thousand, eight hundred twenty".