42172037 has 4 divisors (see below), whose sum is σ = 42415980. Its totient is φ = 41928096.

The previous prime is 42172033. The next prime is 42172043. The reversal of 42172037 is 73027124.

42172037 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 6494²+1.

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

It can be written as a sum of positive squares in 2 ways, for example, as 38365636 + 3806401 = 6194^2 + 1951^2 .

It is a cyclic number.

It is not a de Polignac number, because 42172037 - 2² = 42172033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42171997 and 42172015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42172033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121712 + ... + 122057.

It is an arithmetic number, because the mean of its divisors is an integer number (10603995).

Almost surely, 2^42172037 is an apocalyptic number.

It is an amenable number.

42172037 is a deficient number, since it is larger than the sum of its proper divisors (243943).

42172037 is a wasteful number, since it uses less digits than its factorization.

42172037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243942.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 42172037 is about 6494.0000769941. Note that the first 4 decimals coincide. The cubic root of 42172037 is about 348.0766252416.

The spelling of 42172037 in words is "forty-two million, one hundred seventy-two thousand, thirty-seven".