42540905 has 16 divisors (see below), whose sum is σ = 58622400. Its totient is φ = 29309760.

The previous prime is 42540899. The next prime is 42540917. The reversal of 42540905 is 50904524.

It is a happy number.

42540905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-42540905 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19310 + ... + 21399.

It is an arithmetic number, because the mean of its divisors is an integer number (3663900).

Almost surely, 2^42540905 is an apocalyptic number.

It is an amenable number.

42540905 is a deficient number, since it is larger than the sum of its proper divisors (16081495).

42540905 is a wasteful number, since it uses less digits than its factorization.

42540905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40744.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 42540905 is about 6522.3389209700. The cubic root of 42540905 is about 349.0885263505.

The spelling of 42540905 in words is "forty-two million, five hundred forty thousand, nine hundred five".