1213544988 has 18 divisors (see below), whose sum is σ = 3067572144. Its totient is φ = 404514984.

The previous prime is 1213544977. The next prime is 1213544989. The reversal of 1213544988 is 8894453121.

1213544988 is a `hidden beast` number, since 1 + 2 + 13 + 544 + 98 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213544989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16854756 + ... + 16854827.

Almost surely, 2^1213544988 is an apocalyptic number.

1213544988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1213544988 is an abundant number, since it is smaller than the sum of its proper divisors (1854027156).

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

1213544988 is a wasteful number, since it uses less digits than its factorization.

1213544988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33709593 (or 33709588 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 1213544988 is about 34835.9726145259. The cubic root of 1213544988 is about 1066.6418687377.

The spelling of 1213544988 in words is "one billion, two hundred thirteen million, five hundred forty-four thousand, nine hundred eighty-eight".