43705121 has 4 divisors (see below), whose sum is σ = 43748544. Its totient is φ = 43661700.

The previous prime is 43705093. The next prime is 43705153. The reversal of 43705121 is 12150734.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12150734 = 2 ⋅6075367.

It is a cyclic number.

It is not a de Polignac number, because 43705121 - 2¹⁰ = 43704097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43705021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20165 + ... + 22226.

It is an arithmetic number, because the mean of its divisors is an integer number (10937136).

Almost surely, 2^43705121 is an apocalyptic number.

It is an amenable number.

43705121 is a deficient number, since it is larger than the sum of its proper divisors (43423).

43705121 is a wasteful number, since it uses less digits than its factorization.

43705121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43422.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 43705121 is about 6610.9848736781. The cubic root of 43705121 is about 352.2444093929.

Adding to 43705121 its reverse (12150734), we get a palindrome (55855855).

The spelling of 43705121 in words is "forty-three million, seven hundred five thousand, one hundred twenty-one".