7987898 has 4 divisors (see below), whose sum is σ = 11981850. Its totient is φ = 3993948.

The previous prime is 7987897. The next prime is 7987901. The reversal of 7987898 is 8987897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8987897 = 41 ⋅219217.

It can be written as a sum of positive squares in only one way, i.e., 4464769 + 3523129 = 2113^2 + 1877^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7987897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1996973 + ... + 1996976.

Almost surely, 2^7987898 is an apocalyptic number.

7987898 is a deficient number, since it is larger than the sum of its proper divisors (3993952).

7987898 is a wasteful number, since it uses less digits than its factorization.

7987898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3993951.

The product of its digits is 2032128, while the sum is 56.

The square root of 7987898 is about 2826.2869634911. The cubic root of 7987898 is about 199.8990991036.

Subtracting 7987898 from its reverse (8987897), we obtain a palindrome (999999).

The spelling of 7987898 in words is "seven million, nine hundred eighty-seven thousand, eight hundred ninety-eight".