1001781444 has 12 divisors (see below), whose sum is σ = 2337490064. Its totient is φ = 333927144.

The previous prime is 1001781437. The next prime is 1001781493. The reversal of 1001781444 is 4441871001.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41740882 + ... + 41740905.

Almost surely, 2^1001781444 is an apocalyptic number.

It is an amenable number.

1001781444 is an abundant number, since it is smaller than the sum of its proper divisors (1335708620).

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

1001781444 is a wasteful number, since it uses less digits than its factorization.

1001781444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83481794 (or 83481792 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 1001781444 is about 31650.9311711362. The cubic root of 1001781444 is about 1000.5934623994.

The spelling of 1001781444 in words is "one billion, one million, seven hundred eighty-one thousand, four hundred forty-four".