1001389872 has 100 divisors (see below), whose sum is σ = 3018245560. Its totient is φ = 286078464.

The previous prime is 1001389789. The next prime is 1001389877. The reversal of 1001389872 is 2789831001.

It is a self number, because there is not a number n which added to its sum of digits gives 1001389872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001389877) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 110904 + ... + 119592.

Almost surely, 2^1001389872 is an apocalyptic number.

1001389872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1001389872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1509122780).

1001389872 is an abundant number, since it is smaller than the sum of its proper divisors (2016855688).

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

1001389872 is an frugal number, since it uses more digits than its factorization.

1001389872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8728 (or 8701 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 1001389872 is about 31644.7447769768. The cubic root of 1001389872 is about 1000.4630761940.

The spelling of 1001389872 in words is "one billion, one million, three hundred eighty-nine thousand, eight hundred seventy-two".