42647993 has 4 divisors (see below), whose sum is σ = 42661668. Its totient is φ = 42634320.

The previous prime is 42647981. The next prime is 42648037. The reversal of 42647993 is 39974624.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 38539264 + 4108729 = 6208^2 + 2027^2 .

It is a cyclic number.

It is not a de Polignac number, because 42647993 - 2⁴ = 42647977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42647903) 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, 383 + ... + 9243.

It is an arithmetic number, because the mean of its divisors is an integer number (10665417).

Almost surely, 2^42647993 is an apocalyptic number.

It is an amenable number.

42647993 is a deficient number, since it is larger than the sum of its proper divisors (13675).

42647993 is an equidigital number, since it uses as much as digits as its factorization.

42647993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13674.

The product of its digits is 326592, while the sum is 44.

The square root of 42647993 is about 6530.5430861453. The cubic root of 42647993 is about 349.3812004856.

The spelling of 42647993 in words is "forty-two million, six hundred forty-seven thousand, nine hundred ninety-three".