43139806500 has 384 divisors, whose sum is σ = 146865438720. Its totient is φ = 9637056000.

The previous prime is 43139806447. The next prime is 43139806559. The reversal of 43139806500 is 560893134.

It is a super-2 number, since 2×43139806500² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 108664302 + ... + 108664698.

It is an arithmetic number, because the mean of its divisors is an integer number (382462080).

Almost surely, 2^43139806500 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 43139806500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73432719360).

43139806500 is an abundant number, since it is smaller than the sum of its proper divisors (103725632220).

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

43139806500 is a wasteful number, since it uses less digits than its factorization.

43139806500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636 (or 624 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The spelling of 43139806500 in words is "forty-three billion, one hundred thirty-nine million, eight hundred six thousand, five hundred".