42166209 has 8 divisors (see below), whose sum is σ = 56253280. Its totient is φ = 28094976.

The previous prime is 42166207. The next prime is 42166211. The reversal of 42166209 is 90266124.

It is an interprime number because it is at equal distance from previous prime (42166207) and next prime (42166211).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42166209 - 2¹ = 42166207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42166207) 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, 5454 + ... + 10680.

It is an arithmetic number, because the mean of its divisors is an integer number (7031660).

Almost surely, 2^42166209 is an apocalyptic number.

It is an amenable number.

42166209 is a deficient number, since it is larger than the sum of its proper divisors (14087071).

42166209 is a wasteful number, since it uses less digits than its factorization.

42166209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7919.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 42166209 is about 6493.5513395984. The cubic root of 42166209 is about 348.0605902559.

The spelling of 42166209 in words is "forty-two million, one hundred sixty-six thousand, two hundred nine".