42749825 has 6 divisors (see below), whose sum is σ = 53009814. Its totient is φ = 34199840.

The previous prime is 42749813. The next prime is 42749831. The reversal of 42749825 is 52894724.

It can be written as a sum of positive squares in 3 ways, for example, as 863041 + 41886784 = 929^2 + 6472^2 .

It is not a de Polignac number, because 42749825 - 2⁸ = 42749569 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 854972 + ... + 855021.

It is an arithmetic number, because the mean of its divisors is an integer number (8834969).

Almost surely, 2^42749825 is an apocalyptic number.

It is an amenable number.

42749825 is a deficient number, since it is larger than the sum of its proper divisors (10259989).

42749825 is a wasteful number, since it uses less digits than its factorization.

42749825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710003 (or 1709998 counting only the distinct ones).

The product of its digits is 161280, while the sum is 41.

The square root of 42749825 is about 6538.3350327128. The cubic root of 42749825 is about 349.6590557401.

The spelling of 42749825 in words is "forty-two million, seven hundred forty-nine thousand, eight hundred twenty-five".