40042171 has 4 divisors (see below), whose sum is σ = 43122352. Its totient is φ = 36961992.

The previous prime is 40042153. The next prime is 40042181. The reversal of 40042171 is 17124004.

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

It is a cyclic number.

It is not a de Polignac number, because 40042171 - 2⁷ = 40042043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40042141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1540071 + ... + 1540096.

It is an arithmetic number, because the mean of its divisors is an integer number (10780588).

Almost surely, 2^40042171 is an apocalyptic number.

40042171 is a deficient number, since it is larger than the sum of its proper divisors (3080181).

40042171 is a wasteful number, since it uses less digits than its factorization.

40042171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3080180.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 40042171 is about 6327.8883523653. Note that the first 3 decimals coincide. The cubic root of 40042171 is about 342.1153327832.

Adding to 40042171 its reverse (17124004), we get a palindrome (57166175).

The spelling of 40042171 in words is "forty million, forty-two thousand, one hundred seventy-one".