1213331340 has 48 divisors (see below), whose sum is σ = 3658663008. Its totient is φ = 298665984.

The previous prime is 1213331333. The next prime is 1213331347. The reversal of 1213331340 is 431333121.

It is an interprime number because it is at equal distance from previous prime (1213331333) and next prime (1213331347).

It is not an unprimeable number, because it can be changed into a prime (1213331347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 776997 + ... + 778556.

It is an arithmetic number, because the mean of its divisors is an integer number (76222146).

Almost surely, 2^1213331340 is an apocalyptic number.

1213331340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213331340 is an abundant number, since it is smaller than the sum of its proper divisors (2445331668).

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

1213331340 is a wasteful number, since it uses less digits than its factorization.

1213331340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555578 (or 1555576 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 1213331340 is about 34832.9059941889. The cubic root of 1213331340 is about 1066.5792699661.

Adding to 1213331340 its reverse (431333121), we get a palindrome (1644664461).

The spelling of 1213331340 in words is "one billion, two hundred thirteen million, three hundred thirty-one thousand, three hundred forty".