42807945 has 32 divisors (see below), whose sum is σ = 71995392. Its totient is φ = 21678272.

The previous prime is 42807937. The next prime is 42807949. The reversal of 42807945 is 54970824.

It is a cyclic number.

It is not a de Polignac number, because 42807945 - 2³ = 42807937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42807949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57244 + ... + 57986.

It is an arithmetic number, because the mean of its divisors is an integer number (2249856).

Almost surely, 2^42807945 is an apocalyptic number.

It is an amenable number.

42807945 is a deficient number, since it is larger than the sum of its proper divisors (29187447).

42807945 is a wasteful number, since it uses less digits than its factorization.

42807945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 941.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 42807945 is about 6542.7780796845. The cubic root of 42807945 is about 349.8174422105.

The spelling of 42807945 in words is "forty-two million, eight hundred seven thousand, nine hundred forty-five".