42805923 has 4 divisors (see below), whose sum is σ = 57074568. Its totient is φ = 28537280.

The previous prime is 42805907. The next prime is 42805963. The reversal of 42805923 is 32950824.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 42805923 - 2⁴ = 42805907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42805963) 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, 7134318 + ... + 7134323.

It is an arithmetic number, because the mean of its divisors is an integer number (14268642).

Almost surely, 2^42805923 is an apocalyptic number.

42805923 is a deficient number, since it is larger than the sum of its proper divisors (14268645).

42805923 is a wasteful number, since it uses less digits than its factorization.

42805923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14268644.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 42805923 is about 6542.6235563419. The cubic root of 42805923 is about 349.8119343388.

The spelling of 42805923 in words is "forty-two million, eight hundred five thousand, nine hundred twenty-three".