42008663 has 4 divisors (see below), whose sum is σ = 42441840. Its totient is φ = 41575488.

The previous prime is 42008621. The next prime is 42008671. The reversal of 42008663 is 36680024.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42008663 - 2⁶ = 42008599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42008693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216443 + ... + 216636.

It is an arithmetic number, because the mean of its divisors is an integer number (10610460).

Almost surely, 2^42008663 is an apocalyptic number.

42008663 is a deficient number, since it is larger than the sum of its proper divisors (433177).

42008663 is an equidigital number, since it uses as much as digits as its factorization.

42008663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433176.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 42008663 is about 6481.4090289072. The cubic root of 42008663 is about 347.6265619082.

Adding to 42008663 its reverse (36680024), we get a palindrome (78688687).

The spelling of 42008663 in words is "forty-two million, eight thousand, six hundred sixty-three".