8139840 has 112 divisors (see below), whose sum is σ = 26456640. Its totient is φ = 2119680.

The previous prime is 8139829. The next prime is 8139869. The reversal of 8139840 is 489318.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58491 + ... + 58629.

It is an arithmetic number, because the mean of its divisors is an integer number (236220).

Almost surely, 2^8139840 is an apocalyptic number.

8139840 is a gapful number since it is divisible by the number (80) 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 8139840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13228320).

8139840 is an abundant number, since it is smaller than the sum of its proper divisors (18316800).

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

8139840 is a wasteful number, since it uses less digits than its factorization.

8139840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 210 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 8139840 is about 2853.0404834141. The cubic root of 8139840 is about 201.1586085043.

The spelling of 8139840 in words is "eight million, one hundred thirty-nine thousand, eight hundred forty".