1243542144 has 64 divisors (see below), whose sum is σ = 3557262240. Its totient is φ = 382626816.

The previous prime is 1243542143. The next prime is 1243542151. The reversal of 1243542144 is 4412453421.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (1243542143) 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 7 ways as a sum of consecutive naturals, for example, 119562 + ... + 129545.

Almost surely, 2^1243542144 is an apocalyptic number.

It is an amenable number.

1243542144 is an abundant number, since it is smaller than the sum of its proper divisors (2313720096).

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

1243542144 is a wasteful number, since it uses less digits than its factorization.

1243542144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249137 (or 249125 counting only the distinct ones).

The product of its digits is 15360, while the sum is 30.

The square root of 1243542144 is about 35263.8929217975. The cubic root of 1243542144 is about 1075.3590706757.

Adding to 1243542144 its reverse (4412453421), we get a palindrome (5655995565).

The spelling of 1243542144 in words is "one billion, two hundred forty-three million, five hundred forty-two thousand, one hundred forty-four".