43139538 has 96 divisors (see below), whose sum is σ = 109724160. Its totient is φ = 12130560.

The previous prime is 43139533. The next prime is 43139539. The reversal of 43139538 is 83593134.

It is a super-2 number, since 2×43139538² = 3722039477706888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (43139533) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 137670 + ... + 137982.

It is an arithmetic number, because the mean of its divisors is an integer number (1142960).

Almost surely, 2^43139538 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43139538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54862080).

43139538 is an abundant number, since it is smaller than the sum of its proper divisors (66584622).

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

43139538 is a wasteful number, since it uses less digits than its factorization.

43139538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384 (or 381 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 43139538 is about 6568.0695794122. The cubic root of 43139538 is about 350.7183558975.

The spelling of 43139538 in words is "forty-three million, one hundred thirty-nine thousand, five hundred thirty-eight".