1213240864 has 72 divisors (see below), whose sum is σ = 2635161984. Its totient is φ = 549436800.

The previous prime is 1213240849. The next prime is 1213240867. The reversal of 1213240864 is 4680423121.

It is not an unprimeable number, because it can be changed into a prime (1213240867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1668469 + ... + 1669195.

It is an arithmetic number, because the mean of its divisors is an integer number (36599472).

Almost surely, 2^1213240864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213240864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1317580992).

1213240864 is an abundant number, since it is smaller than the sum of its proper divisors (1421921120).

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

1213240864 is a wasteful number, since it uses less digits than its factorization.

1213240864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1190 (or 1171 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 1213240864 is about 34831.6072554799. The cubic root of 1213240864 is about 1066.5527583224.

Adding to 1213240864 its reverse (4680423121), we get a palindrome (5893663985).

The spelling of 1213240864 in words is "one billion, two hundred thirteen million, two hundred forty thousand, eight hundred sixty-four".