42445273 has 4 divisors (see below), whose sum is σ = 45710308. Its totient is φ = 39180240.

The previous prime is 42445223. The next prime is 42445279. The reversal of 42445273 is 37254424.

It is a happy number.

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 3968064 + 38477209 = 1992^2 + 6203^2 .

It is a cyclic number.

It is not a de Polignac number, because 42445273 - 2⁹ = 42444761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42445279) 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, 1632498 + ... + 1632523.

It is an arithmetic number, because the mean of its divisors is an integer number (11427577).

Almost surely, 2^42445273 is an apocalyptic number.

It is an amenable number.

42445273 is a deficient number, since it is larger than the sum of its proper divisors (3265035).

42445273 is a wasteful number, since it uses less digits than its factorization.

42445273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3265034.

The product of its digits is 26880, while the sum is 31.

The square root of 42445273 is about 6515.0036838056. The cubic root of 42445273 is about 348.8267462981.

Adding to 42445273 its reverse (37254424), we get a palindrome (79699697).

It can be divided in two parts, 4244527 and 3, that multiplied together give a triangular number (12733581 = T₅₀₄₆).

The spelling of 42445273 in words is "forty-two million, four hundred forty-five thousand, two hundred seventy-three".