1213243140 has 48 divisors (see below), whose sum is σ = 3461185728. Its totient is φ = 317426304.

The previous prime is 1213243127. The next prime is 1213243183. The reversal of 1213243140 is 413423121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187582 + ... + 193941.

It is an arithmetic number, because the mean of its divisors is an integer number (72108036).

Almost surely, 2^1213243140 is an apocalyptic number.

1213243140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213243140 is an abundant number, since it is smaller than the sum of its proper divisors (2247942588).

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

1213243140 is a wasteful number, since it uses less digits than its factorization.

1213243140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381588 (or 381586 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1213243140 is about 34831.6399269400. The cubic root of 1213243140 is about 1066.5534252613.

Adding to 1213243140 its reverse (413423121), we get a palindrome (1626666261).

The spelling of 1213243140 in words is "one billion, two hundred thirteen million, two hundred forty-three thousand, one hundred forty".