43739971 has 4 divisors (see below), whose sum is σ = 47716344. Its totient is φ = 39763600.

The previous prime is 43739953. The next prime is 43740007. The reversal of 43739971 is 17993734.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 43739971 - 2²¹ = 41642819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43739911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1988170 + ... + 1988191.

It is an arithmetic number, because the mean of its divisors is an integer number (11929086).

Almost surely, 2^43739971 is an apocalyptic number.

43739971 is a deficient number, since it is larger than the sum of its proper divisors (3976373).

43739971 is a wasteful number, since it uses less digits than its factorization.

43739971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3976372.

The product of its digits is 142884, while the sum is 43.

The square root of 43739971 is about 6613.6201130697. The cubic root of 43739971 is about 352.3380098374.

The spelling of 43739971 in words is "forty-three million, seven hundred thirty-nine thousand, nine hundred seventy-one".