7887998 has 4 divisors (see below), whose sum is σ = 11832000. Its totient is φ = 3943998.

The previous prime is 7887989. The next prime is 7888007. The reversal of 7887998 is 8997887.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (7887989) and next prime (7888007).

It is a Curzon 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, 1971998 + ... + 1972001.

It is an arithmetic number, because the mean of its divisors is an integer number (2958000).

Almost surely, 2^7887998 is an apocalyptic number.

7887998 is a deficient number, since it is larger than the sum of its proper divisors (3944002).

7887998 is a wasteful number, since it uses less digits than its factorization.

7887998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3944001.

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

The square root of 7887998 is about 2808.5579929921. The cubic root of 7887998 is about 199.0622600910.

The spelling of 7887998 in words is "seven million, eight hundred eighty-seven thousand, nine hundred ninety-eight".