42002665 has 16 divisors (see below), whose sum is σ = 53852688. Its totient is φ = 31338496.

The previous prime is 42002657. The next prime is 42002687. The reversal of 42002665 is 56620024.

It can be written as a sum of positive squares in 8 ways, for example, as 1857769 + 40144896 = 1363^2 + 6336^2 .

It is a cyclic number.

It is not a de Polignac number, because 42002665 - 2³ = 42002657 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 15 ways as a sum of consecutive naturals, for example, 7419 + ... + 11791.

It is an arithmetic number, because the mean of its divisors is an integer number (3365793).

Almost surely, 2^42002665 is an apocalyptic number.

It is an amenable number.

42002665 is a deficient number, since it is larger than the sum of its proper divisors (11850023).

42002665 is a wasteful number, since it uses less digits than its factorization.

42002665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4508.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 42002665 is about 6480.9463043602. The cubic root of 42002665 is about 347.6100164054.

Adding to 42002665 its reverse (56620024), we get a palindrome (98622689).

The spelling of 42002665 in words is "forty-two million, two thousand, six hundred sixty-five".