42905855 has 4 divisors (see below), whose sum is σ = 51487032. Its totient is φ = 34324680.

The previous prime is 42905843. The next prime is 42905861. The reversal of 42905855 is 55850924.

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

It is not a de Polignac number, because 42905855 - 2⁴ = 42905839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4290581 + ... + 4290590.

It is an arithmetic number, because the mean of its divisors is an integer number (12871758).

Almost surely, 2^42905855 is an apocalyptic number.

42905855 is a deficient number, since it is larger than the sum of its proper divisors (8581177).

42905855 is an equidigital number, since it uses as much as digits as its factorization.

42905855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8581176.

The product of its (nonzero) digits is 72000, while the sum is 38.

The square root of 42905855 is about 6550.2561018635. The cubic root of 42905855 is about 350.0839390513.

The spelling of 42905855 in words is "forty-two million, nine hundred five thousand, eight hundred fifty-five".