1213044240 has 40 divisors (see below), whose sum is σ = 3760437888. Its totient is φ = 323478400.

The previous prime is 1213044193. The next prime is 1213044241. The reversal of 1213044240 is 424403121.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (1213044241) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2526936 + ... + 2527415.

Almost surely, 2^1213044240 is an apocalyptic number.

1213044240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213044240 is an abundant number, since it is smaller than the sum of its proper divisors (2547393648).

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

1213044240 is a wasteful number, since it uses less digits than its factorization.

1213044240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5054367 (or 5054361 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1213044240 is about 34828.7846471851. The cubic root of 1213044240 is about 1066.4951382170.

Adding to 1213044240 its reverse (424403121), we get a palindrome (1637447361).

The spelling of 1213044240 in words is "one billion, two hundred thirteen million, forty-four thousand, two hundred forty".