1001149644 has 144 divisors (see below), whose sum is σ = 2680207488. Its totient is φ = 290400000.

The previous prime is 1001149621. The next prime is 1001149651. The reversal of 1001149644 is 4469411001.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3988519 + ... + 3988769.

It is an arithmetic number, because the mean of its divisors is an integer number (18612552).

Almost surely, 2^1001149644 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 1001149644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1340103744).

1001149644 is an abundant number, since it is smaller than the sum of its proper divisors (1679057844).

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

1001149644 is a wasteful number, since it uses less digits than its factorization.

1001149644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388 (or 375 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 1001149644 is about 31640.9488479723. The cubic root of 1001149644 is about 1000.3830679069.

The spelling of 1001149644 in words is "one billion, one million, one hundred forty-nine thousand, six hundred forty-four".