42489845 has 4 divisors (see below), whose sum is σ = 50987820. Its totient is φ = 33991872.

The previous prime is 42489841. The next prime is 42489877. The reversal of 42489845 is 54898424.

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 32364721 + 10125124 = 5689^2 + 3182^2 .

It is a cyclic number.

It is not a de Polignac number, because 42489845 - 2² = 42489841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42489796 and 42489805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42489841) 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, 4248980 + ... + 4248989.

It is an arithmetic number, because the mean of its divisors is an integer number (12746955).

Almost surely, 2^42489845 is an apocalyptic number.

It is an amenable number.

42489845 is a deficient number, since it is larger than the sum of its proper divisors (8497975).

42489845 is an equidigital number, since it uses as much as digits as its factorization.

42489845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8497974.

The product of its digits is 368640, while the sum is 44.

The square root of 42489845 is about 6518.4235057259. The cubic root of 42489845 is about 348.9488051714.

It can be divided in two parts, 42489 and 845, that added together give a palindrome (43334).

The spelling of 42489845 in words is "forty-two million, four hundred eighty-nine thousand, eight hundred forty-five".