42172673 has 2 divisors, whose sum is σ = 42172674. Its totient is φ = 42172672.

The previous prime is 42172667. The next prime is 42172717. The reversal of 42172673 is 37627124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32581264 + 9591409 = 5708^2 + 3097^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42172673 is a prime.

It is not a weakly prime, because it can be changed into another prime (42172643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21086336 + 21086337.

It is an arithmetic number, because the mean of its divisors is an integer number (21086337).

Almost surely, 2^42172673 is an apocalyptic number.

It is an amenable number.

42172673 is a deficient number, since it is larger than the sum of its proper divisors (1).

42172673 is an equidigital number, since it uses as much as digits as its factorization.

42172673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 32.

The square root of 42172673 is about 6494.0490450874. The cubic root of 42172673 is about 348.0783750237.

Adding to 42172673 its reverse (37627124), we get a palindrome (79799797).

The spelling of 42172673 in words is "forty-two million, one hundred seventy-two thousand, six hundred seventy-three".