8139872 has 48 divisors (see below), whose sum is σ = 18289152. Its totient is φ = 3532800.

The previous prime is 8139871. The next prime is 8139917. The reversal of 8139872 is 2789318.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8139871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6497 + ... + 7647.

It is an arithmetic number, because the mean of its divisors is an integer number (381024).

Almost surely, 2^8139872 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 8139872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9144576).

8139872 is an abundant number, since it is smaller than the sum of its proper divisors (10149280).

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

8139872 is a wasteful number, since it uses less digits than its factorization.

8139872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1191 (or 1183 counting only the distinct ones).

The product of its digits is 24192, while the sum is 38.

The square root of 8139872 is about 2853.0460914608. The cubic root of 8139872 is about 201.1588721076.

The spelling of 8139872 in words is "eight million, one hundred thirty-nine thousand, eight hundred seventy-two".