42605993 has 4 divisors (see below), whose sum is σ = 42650580. Its totient is φ = 42561408.

The previous prime is 42605977. The next prime is 42606001. The reversal of 42605993 is 39950624.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21187609 + 21418384 = 4603^2 + 4628^2 .

It is a cyclic number.

It is not a de Polignac number, because 42605993 - 2⁴ = 42605977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42605393) 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, 20828 + ... + 22781.

It is an arithmetic number, because the mean of its divisors is an integer number (10662645).

Almost surely, 2^42605993 is an apocalyptic number.

It is an amenable number.

42605993 is a deficient number, since it is larger than the sum of its proper divisors (44587).

42605993 is an equidigital number, since it uses as much as digits as its factorization.

42605993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44586.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 42605993 is about 6527.3266350015. The cubic root of 42605993 is about 349.2664719131.

The spelling of 42605993 in words is "forty-two million, six hundred five thousand, nine hundred ninety-three".