42165806 has 4 divisors (see below), whose sum is σ = 63248712. Its totient is φ = 21082902.

The previous prime is 42165791. The next prime is 42165821. The reversal of 42165806 is 60856124.

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

It is an interprime number because it is at equal distance from previous prime (42165791) and next prime (42165821).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10541450 + ... + 10541453.

It is an arithmetic number, because the mean of its divisors is an integer number (15812178).

Almost surely, 2^42165806 is an apocalyptic number.

42165806 is a deficient number, since it is larger than the sum of its proper divisors (21082906).

42165806 is a wasteful number, since it uses less digits than its factorization.

42165806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21082905.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 42165806 is about 6493.5203087386. The cubic root of 42165806 is about 348.0594813991.

The spelling of 42165806 in words is "forty-two million, one hundred sixty-five thousand, eight hundred six".