43971538 has 32 divisors (see below), whose sum is σ = 74793600. Its totient is φ = 19272528.

The previous prime is 43971533. The next prime is 43971541. The reversal of 43971538 is 83517934.

It is a self number, because there is not a number n which added to its sum of digits gives 43971538.

It is not an unprimeable number, because it can be changed into a prime (43971533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 316273 + ... + 316411.

It is an arithmetic number, because the mean of its divisors is an integer number (2337300).

Almost surely, 2^43971538 is an apocalyptic number.

43971538 is a deficient number, since it is larger than the sum of its proper divisors (30822062).

43971538 is a wasteful number, since it uses less digits than its factorization.

43971538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223 (or 177 counting only the distinct ones).

The product of its digits is 90720, while the sum is 40.

The square root of 43971538 is about 6631.1038296802. The cubic root of 43971538 is about 352.9586953145.

The spelling of 43971538 in words is "forty-three million, nine hundred seventy-one thousand, five hundred thirty-eight".