43957971385 has 8 divisors (see below), whose sum is σ = 53134599816. Its totient is φ = 34909687680.

The previous prime is 43957971383. The next prime is 43957971401. The reversal of 43957971385 is 58317975934.

It is a happy number.

43957971385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 17580638464 + 26377332921 = 132592^2 + 162411^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 43957971385 - 2¹ = 43957971383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43957971383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32085426 + ... + 32086795.

It is an arithmetic number, because the mean of its divisors is an integer number (6641824977).

Almost surely, 2^43957971385 is an apocalyptic number.

It is an amenable number.

43957971385 is a deficient number, since it is larger than the sum of its proper divisors (9176628431).

43957971385 is a wasteful number, since it uses less digits than its factorization.

43957971385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64172363.

The product of its digits is 28576800, while the sum is 61.

The spelling of 43957971385 in words is "forty-three billion, nine hundred fifty-seven million, nine hundred seventy-one thousand, three hundred eighty-five".