42173245 has 8 divisors (see below), whose sum is σ = 50745816. Its totient is φ = 33646656.

The previous prime is 42173231. The next prime is 42173249. The reversal of 42173245 is 54237124.

It can be written as a sum of positive squares in 4 ways, for example, as 3956121 + 38217124 = 1989^2 + 6182^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42173245 - 2¹⁵ = 42140477 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 (42173249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9442 + ... + 13171.

It is an arithmetic number, because the mean of its divisors is an integer number (6343227).

Almost surely, 2^42173245 is an apocalyptic number.

It is an amenable number.

42173245 is a deficient number, since it is larger than the sum of its proper divisors (8572571).

42173245 is a wasteful number, since it uses less digits than its factorization.

42173245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22991.

The product of its digits is 6720, while the sum is 28.

The square root of 42173245 is about 6494.0930852583. The cubic root of 42173245 is about 348.0799487120.

The spelling of 42173245 in words is "forty-two million, one hundred seventy-three thousand, two hundred forty-five".