42845945 has 4 divisors (see below), whose sum is σ = 51415140. Its totient is φ = 34276752.

The previous prime is 42845939. The next prime is 42845947. The reversal of 42845945 is 54954824.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19882681 + 22963264 = 4459^2 + 4792^2 .

It is a cyclic number.

It is not a de Polignac number, because 42845945 - 2¹² = 42841849 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42845947) 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, 4284590 + ... + 4284599.

It is an arithmetic number, because the mean of its divisors is an integer number (12853785).

Almost surely, 2^42845945 is an apocalyptic number.

It is an amenable number.

42845945 is a deficient number, since it is larger than the sum of its proper divisors (8569195).

42845945 is an equidigital number, since it uses as much as digits as its factorization.

42845945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8569194.

The product of its digits is 230400, while the sum is 41.

The square root of 42845945 is about 6545.6814007405. The cubic root of 42845945 is about 349.9209209097.

The spelling of 42845945 in words is "forty-two million, eight hundred forty-five thousand, nine hundred forty-five".