7987918 has 4 divisors (see below), whose sum is σ = 11981880. Its totient is φ = 3993958.

The previous prime is 7987901. The next prime is 7987921. The reversal of 7987918 is 8197897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8197897 = 2269 ⋅3613.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1996978 + ... + 1996981.

It is an arithmetic number, because the mean of its divisors is an integer number (2995470).

Almost surely, 2^7987918 is an apocalyptic number.

7987918 is a deficient number, since it is larger than the sum of its proper divisors (3993962).

7987918 is a wasteful number, since it uses less digits than its factorization.

7987918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3993961.

The product of its digits is 254016, while the sum is 49.

The square root of 7987918 is about 2826.2905017001. The cubic root of 7987918 is about 199.8992659384.

It can be divided in two parts, 79879 and 18, that added together give a palindrome (79897).

The spelling of 7987918 in words is "seven million, nine hundred eighty-seven thousand, nine hundred eighteen".