42478905 has 32 divisors (see below), whose sum is σ = 78269184. Its totient is φ = 19270656.

The previous prime is 42478859. The next prime is 42478921. The reversal of 42478905 is 50987424.

It is not a de Polignac number, because 42478905 - 2⁶ = 42478841 is a prime.

It is an unprimeable number.

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, 12909 + ... + 15861.

It is an arithmetic number, because the mean of its divisors is an integer number (2445912).

Almost surely, 2^42478905 is an apocalyptic number.

It is an amenable number.

42478905 is a deficient number, since it is larger than the sum of its proper divisors (35790279).

42478905 is a wasteful number, since it uses less digits than its factorization.

42478905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3105.

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

The square root of 42478905 is about 6517.5842917449. The cubic root of 42478905 is about 348.9188542689.

The spelling of 42478905 in words is "forty-two million, four hundred seventy-eight thousand, nine hundred five".