42618993 has 4 divisors (see below), whose sum is σ = 56825328. Its totient is φ = 28412660.

The previous prime is 42618991. The next prime is 42618997. The reversal of 42618993 is 39981624.

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 42618993 - 2¹ = 42618991 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42618991) 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, 7103163 + ... + 7103168.

It is an arithmetic number, because the mean of its divisors is an integer number (14206332).

Almost surely, 2^42618993 is an apocalyptic number.

It is an amenable number.

42618993 is a deficient number, since it is larger than the sum of its proper divisors (14206335).

42618993 is a wasteful number, since it uses less digits than its factorization.

42618993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14206334.

The product of its digits is 93312, while the sum is 42.

The square root of 42618993 is about 6528.3223725548. The cubic root of 42618993 is about 349.3019911918.

The spelling of 42618993 in words is "forty-two million, six hundred eighteen thousand, nine hundred ninety-three".