42172373 has 2 divisors, whose sum is σ = 42172374. Its totient is φ = 42172372.

The previous prime is 42172331. The next prime is 42172397. The reversal of 42172373 is 37327124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42081169 + 91204 = 6487^2 + 302^2 .

It is a cyclic number.

It is not a de Polignac number, because 42172373 - 2⁶ = 42172309 is a prime.

It is a super-2 number, since 2×42172373² = 3557018088902258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42172303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21086186 + 21086187.

It is an arithmetic number, because the mean of its divisors is an integer number (21086187).

Almost surely, 2^42172373 is an apocalyptic number.

It is an amenable number.

42172373 is a deficient number, since it is larger than the sum of its proper divisors (1).

42172373 is an equidigital number, since it uses as much as digits as its factorization.

42172373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 29.

The square root of 42172373 is about 6494.0259469762. The cubic root of 42172373 is about 348.0775496570.

Adding to 42172373 its reverse (37327124), we get a palindrome (79499497).

The spelling of 42172373 in words is "forty-two million, one hundred seventy-two thousand, three hundred seventy-three".