42000665 has 16 divisors (see below), whose sum is σ = 57853440. Its totient is φ = 28674240.

The previous prime is 42000653. The next prime is 42000683. The reversal of 42000665 is 56600024.

It is not a de Polignac number, because 42000665 - 2⁴ = 42000649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42000665.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5855 + ... + 10875.

It is an arithmetic number, because the mean of its divisors is an integer number (3615840).

Almost surely, 2^42000665 is an apocalyptic number.

It is an amenable number.

42000665 is a deficient number, since it is larger than the sum of its proper divisors (15852775).

42000665 is a wasteful number, since it uses less digits than its factorization.

42000665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5272.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 42000665 is about 6480.7920040686. The cubic root of 42000665 is about 347.6044990486.

Adding to 42000665 its reverse (56600024), we get a palindrome (98600689).

The spelling of 42000665 in words is "forty-two million, six hundred sixty-five", and thus it is an aban number.