1244939648 has 64 divisors (see below), whose sum is σ = 2670829200. Its totient is φ = 575864832.

The previous prime is 1244939639. The next prime is 1244939677. The reversal of 1244939648 is 8469394421.

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

It is a junction number, because it is equal to n+sod(n) for n = 1244939596 and 1244939605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123536 + ... + 133232.

Almost surely, 2^1244939648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1244939648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1335414600).

1244939648 is an abundant number, since it is smaller than the sum of its proper divisors (1425889552).

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

1244939648 is an equidigital number, since it uses as much as digits as its factorization.

1244939648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9787 (or 9775 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 50.

The square root of 1244939648 is about 35283.7023000705. The cubic root of 1244939648 is about 1075.7617526437.

The spelling of 1244939648 in words is "one billion, two hundred forty-four million, nine hundred thirty-nine thousand, six hundred forty-eight".