42705091 has 16 divisors (see below), whose sum is σ = 50658048. Its totient is φ = 35488800.

The previous prime is 42705079. The next prime is 42705097. The reversal of 42705091 is 19050724.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42705091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42705097) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 13906 + ... + 16696.

It is an arithmetic number, because the mean of its divisors is an integer number (3166128).

Almost surely, 2^42705091 is an apocalyptic number.

42705091 is a deficient number, since it is larger than the sum of its proper divisors (7952957).

42705091 is a wasteful number, since it uses less digits than its factorization.

42705091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2922.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 42705091 is about 6534.9132358433. The cubic root of 42705091 is about 349.5370505058.

The spelling of 42705091 in words is "forty-two million, seven hundred five thousand, ninety-one".