8039139840 has 240 divisors, whose sum is σ = 28875214368. Its totient is φ = 2143604736.

The previous prime is 8039139833. The next prime is 8039139841. The reversal of 8039139840 is 489319308.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (8039139841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 615619 + ... + 628541.

Almost surely, 2^8039139840 is an apocalyptic number.

8039139840 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 8039139840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14437607184).

8039139840 is an abundant number, since it is smaller than the sum of its proper divisors (20836074528).

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

8039139840 is an equidigital number, since it uses as much as digits as its factorization.

8039139840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12961 (or 12933 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 8039139840 is about 89661.2504931757. The cubic root of 8039139840 is about 2003.2563485529.

The spelling of 8039139840 in words is "eight billion, thirty-nine million, one hundred thirty-nine thousand, eight hundred forty".