43493657 has 4 divisors (see below), whose sum is σ = 43507380. Its totient is φ = 43479936.

The previous prime is 43493629. The next prime is 43493669. The reversal of 43493657 is 75639434.

43493657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 23921881 + 19571776 = 4891^2 + 4424^2 .

It is a cyclic number.

It is not a de Polignac number, because 43493657 - 2²⁴ = 26716441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43493627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 593 + ... + 9345.

It is an arithmetic number, because the mean of its divisors is an integer number (10876845).

Almost surely, 2^43493657 is an apocalyptic number.

It is an amenable number.

43493657 is a deficient number, since it is larger than the sum of its proper divisors (13723).

43493657 is an equidigital number, since it uses as much as digits as its factorization.

43493657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13722.

The product of its digits is 272160, while the sum is 41.

The square root of 43493657 is about 6594.9721000168. The cubic root of 43493657 is about 351.6753878278.

The spelling of 43493657 in words is "forty-three million, four hundred ninety-three thousand, six hundred fifty-seven".