42809171 has 8 divisors (see below), whose sum is σ = 44797824. Its totient is φ = 40858560.

The previous prime is 42809167. The next prime is 42809177. The reversal of 42809171 is 17190824.

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

It is a cyclic number.

It is not a de Polignac number, because 42809171 - 2² = 42809167 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42809177) 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, 7196 + ... + 11721.

It is an arithmetic number, because the mean of its divisors is an integer number (5599728).

Almost surely, 2^42809171 is an apocalyptic number.

42809171 is a deficient number, since it is larger than the sum of its proper divisors (1988653).

42809171 is a wasteful number, since it uses less digits than its factorization.

42809171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19021.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 42809171 is about 6542.8717701022. The cubic root of 42809171 is about 349.8207817159.

Adding to 42809171 its reverse (17190824), we get a palindrome (59999995).

The spelling of 42809171 in words is "forty-two million, eight hundred nine thousand, one hundred seventy-one".