1244120644 has 48 divisors (see below), whose sum is σ = 2471970816. Its totient is φ = 543830400.

The previous prime is 1244120641. The next prime is 1244120693. The reversal of 1244120644 is 4460214421.

It is not an unprimeable number, because it can be changed into a prime (1244120641) 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 15 ways as a sum of consecutive naturals, for example, 67554 + ... + 83974.

It is an arithmetic number, because the mean of its divisors is an integer number (51499392).

Almost surely, 2^1244120644 is an apocalyptic number.

It is an amenable number.

1244120644 is a deficient number, since it is larger than the sum of its proper divisors (1227850172).

1244120644 is a wasteful number, since it uses less digits than its factorization.

1244120644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16516 (or 16514 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

The square root of 1244120644 is about 35272.0944090367. The cubic root of 1244120644 is about 1075.5257983799.

The spelling of 1244120644 in words is "one billion, two hundred forty-four million, one hundred twenty thousand, six hundred forty-four".