8506139840 has 56 divisors (see below), whose sum is σ = 22096640592. Its totient is φ = 3093140480.

The previous prime is 8506139821. The next prime is 8506139857. The reversal of 8506139840 is 489316058.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 8506139791 and 8506139800.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1204739 + ... + 1211778.

Almost surely, 2^8506139840 is an apocalyptic number.

8506139840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8506139840 is an abundant number, since it is smaller than the sum of its proper divisors (13590500752).

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

8506139840 is a wasteful number, since it uses less digits than its factorization.

8506139840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2416545 (or 2416535 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 8506139840 is about 92228.7365195902. The cubic root of 8506139840 is about 2041.3188191472.

The spelling of 8506139840 in words is "eight billion, five hundred six million, one hundred thirty-nine thousand, eight hundred forty".