42545818 has 12 divisors (see below), whose sum is σ = 74238282. Its totient is φ = 18233880.

The previous prime is 42545753. The next prime is 42545821. The reversal of 42545818 is 81854524.

It can be written as a sum of positive squares in only one way, i.e., 42471289 + 74529 = 6517^2 + 273^2 .

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, 216973 + ... + 217168.

Almost surely, 2^42545818 is an apocalyptic number.

42545818 is a deficient number, since it is larger than the sum of its proper divisors (31692464).

42545818 is a wasteful number, since it uses less digits than its factorization.

42545818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434157 (or 434150 counting only the distinct ones).

The product of its digits is 51200, while the sum is 37.

The square root of 42545818 is about 6522.7155387921. The cubic root of 42545818 is about 349.1019644435.

The spelling of 42545818 in words is "forty-two million, five hundred forty-five thousand, eight hundred eighteen".