7918993 has 4 divisors (see below), whose sum is σ = 7944768. Its totient is φ = 7893220.

The previous prime is 7918987. The next prime is 7919003. The reversal of 7918993 is 3998197.

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 7918993 - 2⁵ = 7918961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7918913) 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, 12421 + ... + 13042.

It is an arithmetic number, because the mean of its divisors is an integer number (1986192).

Almost surely, 2^7918993 is an apocalyptic number.

It is an amenable number.

7918993 is a deficient number, since it is larger than the sum of its proper divisors (25775).

7918993 is a wasteful number, since it uses less digits than its factorization.

7918993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25774.

The product of its digits is 122472, while the sum is 46.

The square root of 7918993 is about 2814.0705392722. The cubic root of 7918993 is about 199.3226502429.

It can be divided in two parts, 7918 and 993, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 7918993 in words is "seven million, nine hundred eighteen thousand, nine hundred ninety-three".