42775845 has 32 divisors (see below), whose sum is σ = 78532608. Its totient is φ = 19476288.

The previous prime is 42775829. The next prime is 42775849. The reversal of 42775845 is 54857724.

It is not a de Polignac number, because 42775845 - 2⁴ = 42775829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42775797 and 42775806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42775849) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31572 + ... + 32898.

It is an arithmetic number, because the mean of its divisors is an integer number (2454144).

Almost surely, 2^42775845 is an apocalyptic number.

It is an amenable number.

42775845 is a deficient number, since it is larger than the sum of its proper divisors (35756763).

42775845 is a wasteful number, since it uses less digits than its factorization.

42775845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1649.

The product of its digits is 313600, while the sum is 42.

The square root of 42775845 is about 6540.3245332323. The cubic root of 42775845 is about 349.7299822166.

The spelling of 42775845 in words is "forty-two million, seven hundred seventy-five thousand, eight hundred forty-five".