42170786 has 16 divisors (see below), whose sum is σ = 73284864. Its totient is φ = 17825184.

The previous prime is 42170783. The next prime is 42170839. The reversal of 42170786 is 68707124.

It is a happy number.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (42170783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19610 + ... + 21653.

It is an arithmetic number, because the mean of its divisors is an integer number (4580304).

Almost surely, 2^42170786 is an apocalyptic number.

42170786 is a deficient number, since it is larger than the sum of its proper divisors (31114078).

42170786 is a wasteful number, since it uses less digits than its factorization.

42170786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41345.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 42170786 is about 6493.9037566013. The cubic root of 42170786 is about 348.0731834020.

The spelling of 42170786 in words is "forty-two million, one hundred seventy thousand, seven hundred eighty-six".