43971913 has 4 divisors (see below), whose sum is σ = 44074368. Its totient is φ = 43869460.

The previous prime is 43971901. The next prime is 43971923. The reversal of 43971913 is 31917934.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 43971913 - 2⁵ = 43971881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43971923) 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, 50581 + ... + 51442.

It is an arithmetic number, because the mean of its divisors is an integer number (11018592).

Almost surely, 2^43971913 is an apocalyptic number.

It is an amenable number.

43971913 is a deficient number, since it is larger than the sum of its proper divisors (102455).

43971913 is a wasteful number, since it uses less digits than its factorization.

43971913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102454.

The product of its digits is 20412, while the sum is 37.

The square root of 43971913 is about 6631.1321054553. The cubic root of 43971913 is about 352.9596986843.

The spelling of 43971913 in words is "forty-three million, nine hundred seventy-one thousand, nine hundred thirteen".