42561985 has 8 divisors (see below), whose sum is σ = 51690240. Its totient is φ = 33639024.

The previous prime is 42561971. The next prime is 42561989. The reversal of 42561985 is 58916524.

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 42561985 - 2¹⁵ = 42529217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42561989) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 50865 + ... + 51694.

It is an arithmetic number, because the mean of its divisors is an integer number (6461280).

Almost surely, 2^42561985 is an apocalyptic number.

It is an amenable number.

42561985 is a deficient number, since it is larger than the sum of its proper divisors (9128255).

42561985 is a wasteful number, since it uses less digits than its factorization.

42561985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102647.

The product of its digits is 86400, while the sum is 40.

The square root of 42561985 is about 6523.9547055448. The cubic root of 42561985 is about 349.1461773023.

It can be divided in two parts, 4256 and 1985, that added together give a square (6241 = 79²).

The spelling of 42561985 in words is "forty-two million, five hundred sixty-one thousand, nine hundred eighty-five".