42172013 has 4 divisors (see below), whose sum is σ = 45416028. Its totient is φ = 38928000.

The previous prime is 42172007. The next prime is 42172033. The reversal of 42172013 is 31027124.

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 28761769 + 13410244 = 5363^2 + 3662^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42172013 is a prime.

It is a Duffinian number.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1621988 + ... + 1622013.

It is an arithmetic number, because the mean of its divisors is an integer number (11354007).

Almost surely, 2^42172013 is an apocalyptic number.

It is an amenable number.

42172013 is a deficient number, since it is larger than the sum of its proper divisors (3244015).

42172013 is a wasteful number, since it uses less digits than its factorization.

42172013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3244014.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 42172013 is about 6493.9982291343. The cubic root of 42172013 is about 348.0765592118.

Adding to 42172013 its reverse (31027124), we get a palindrome (73199137).

The spelling of 42172013 in words is "forty-two million, one hundred seventy-two thousand, thirteen".