43621139 has 4 divisors (see below), whose sum is σ = 43649424. Its totient is φ = 43592856.

The previous prime is 43621121. The next prime is 43621147. The reversal of 43621139 is 93112634.

43621139 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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43621139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43621159) 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, 11687 + ... + 14960.

It is an arithmetic number, because the mean of its divisors is an integer number (10912356).

Almost surely, 2^43621139 is an apocalyptic number.

43621139 is a deficient number, since it is larger than the sum of its proper divisors (28285).

43621139 is a wasteful number, since it uses less digits than its factorization.

43621139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28284.

The product of its digits is 3888, while the sum is 29.

The square root of 43621139 is about 6604.6301183337. The cubic root of 43621139 is about 352.0186451685.

The spelling of 43621139 in words is "forty-three million, six hundred twenty-one thousand, one hundred thirty-nine".