1213840840 has 48 divisors (see below), whose sum is σ = 2882485980. Its totient is φ = 459976320.

The previous prime is 1213840813. The next prime is 1213840841. The reversal of 1213840840 is 480483121.

It can be written as a sum of positive squares in 2 ways, for example, as 1035938596 + 177902244 = 32186^2 + 13338^2 .

It is not an unprimeable number, because it can be changed into a prime (1213840841) 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, 27591 + ... + 56470.

Almost surely, 2^1213840840 is an apocalyptic number.

1213840840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213840840 is an abundant number, since it is smaller than the sum of its proper divisors (1668645140).

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

1213840840 is a wasteful number, since it uses less digits than its factorization.

1213840840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84110 (or 84087 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 1213840840 is about 34840.2187134352. The cubic root of 1213840840 is about 1066.7285411156.

The spelling of 1213840840 in words is "one billion, two hundred thirteen million, eight hundred forty thousand, eight hundred forty".