1213320340 has 24 divisors (see below), whose sum is σ = 2548800072. Its totient is φ = 485170560.

The previous prime is 1213320337. The next prime is 1213320347. The reversal of 1213320340 is 430233121.

It can be written as a sum of positive squares in 4 ways, for example, as 787475844 + 425844496 = 28062^2 + 20636^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213320347) 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, 68482 + ... + 84358.

It is an arithmetic number, because the mean of its divisors is an integer number (106200003).

Almost surely, 2^1213320340 is an apocalyptic number.

1213320340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213320340 is an abundant number, since it is smaller than the sum of its proper divisors (1335479732).

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

1213320340 is a wasteful number, since it uses less digits than its factorization.

1213320340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19707 (or 19705 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1213320340 is about 34832.7480971571. The cubic root of 1213320340 is about 1066.5760467720.

Adding to 1213320340 its reverse (430233121), we get a palindrome (1643553461).

The spelling of 1213320340 in words is "one billion, two hundred thirteen million, three hundred twenty thousand, three hundred forty".