43957381 has 8 divisors (see below), whose sum is σ = 47910240. Its totient is φ = 40086192.

The previous prime is 43957373. The next prime is 43957399. The reversal of 43957381 is 18375934.

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

It is a cyclic number.

It is not a de Polignac number, because 43957381 - 2³ = 43957373 is a prime.

It is a super-2 number, since 2×43957381² = 3864502688758322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43957681) 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, 19291 + ... + 21448.

It is an arithmetic number, because the mean of its divisors is an integer number (5988780).

Almost surely, 2^43957381 is an apocalyptic number.

It is an amenable number.

43957381 is a deficient number, since it is larger than the sum of its proper divisors (3952859).

43957381 is a wasteful number, since it uses less digits than its factorization.

43957381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40835.

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

The square root of 43957381 is about 6630.0362744106. The cubic root of 43957381 is about 352.9208119258.

The spelling of 43957381 in words is "forty-three million, nine hundred fifty-seven thousand, three hundred eighty-one".