42118993 has 4 divisors (see below), whose sum is σ = 48136000. Its totient is φ = 36101988.

The previous prime is 42118963. The next prime is 42118997. The reversal of 42118993 is 39981124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42118993 - 2⁹ = 42118481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42118997) 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, 3008493 + ... + 3008506.

It is an arithmetic number, because the mean of its divisors is an integer number (12034000).

Almost surely, 2^42118993 is an apocalyptic number.

It is an amenable number.

42118993 is a deficient number, since it is larger than the sum of its proper divisors (6017007).

42118993 is an equidigital number, since it uses as much as digits as its factorization.

42118993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6017006.

The product of its digits is 15552, while the sum is 37.

The square root of 42118993 is about 6489.9147143857. The cubic root of 42118993 is about 347.9306270533.

The spelling of 42118993 in words is "forty-two million, one hundred eighteen thousand, nine hundred ninety-three".