1213313240 has 32 divisors (see below), whose sum is σ = 2731050000. Its totient is φ = 485130624.

The previous prime is 1213313203. The next prime is 1213313279. The reversal of 1213313240 is 423133121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135626 + ... + 144294.

Almost surely, 2^1213313240 is an apocalyptic number.

1213313240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213313240 is an abundant number, since it is smaller than the sum of its proper divisors (1517736760).

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

1213313240 is a wasteful number, since it uses less digits than its factorization.

1213313240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12179 (or 12175 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1213313240 is about 34832.6461814201. The cubic root of 1213313240 is about 1066.5739663363.

Adding to 1213313240 its reverse (423133121), we get a palindrome (1636446361).

The spelling of 1213313240 in words is "one billion, two hundred thirteen million, three hundred thirteen thousand, two hundred forty".