43255138 has 4 divisors (see below), whose sum is σ = 64882710. Its totient is φ = 21627568.

The previous prime is 43255129. The next prime is 43255151. The reversal of 43255138 is 83155234.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83155234 = 2 ⋅41577617.

It can be written as a sum of positive squares in only one way, i.e., 24532209 + 18722929 = 4953^2 + 4327^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10813783 + ... + 10813786.

Almost surely, 2^43255138 is an apocalyptic number.

43255138 is a deficient number, since it is larger than the sum of its proper divisors (21627572).

43255138 is a wasteful number, since it uses less digits than its factorization.

43255138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21627571.

The product of its digits is 14400, while the sum is 31.

The square root of 43255138 is about 6576.8638422884. The cubic root of 43255138 is about 351.0313470541.

The spelling of 43255138 in words is "forty-three million, two hundred fifty-five thousand, one hundred thirty-eight".