42665841 has 6 divisors (see below), whose sum is σ = 61628450. Its totient is φ = 28443888.

The previous prime is 42665807. The next prime is 42665867. The reversal of 42665841 is 14856624.

It can be written as a sum of positive squares in only one way, i.e., 39425841 + 3240000 = 6279^2 + 1800^2 .

It is not a de Polignac number, because 42665841 - 2¹¹ = 42663793 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42665796 and 42665805.

It is not an unprimeable number, because it can be changed into a prime (42665891) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2370316 + ... + 2370333.

Almost surely, 2^42665841 is an apocalyptic number.

It is an amenable number.

42665841 is a deficient number, since it is larger than the sum of its proper divisors (18962609).

42665841 is a wasteful number, since it uses less digits than its factorization.

42665841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4740655 (or 4740652 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 42665841 is about 6531.9094451776. The cubic root of 42665841 is about 349.4299318604.

The spelling of 42665841 in words is "forty-two million, six hundred sixty-five thousand, eight hundred forty-one".