7987899 has 8 divisors (see below), whose sum is σ = 10664512. Its totient is φ = 5318280.

The previous prime is 7987897. The next prime is 7987901. The reversal of 7987899 is 9987897.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (7987897) and next prime (7987901).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7987899 - 2¹ = 7987897 is a prime.

It is a Duffinian 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 in 7 ways as a sum of consecutive naturals, for example, 2184 + ... + 4554.

It is an arithmetic number, because the mean of its divisors is an integer number (1333064).

Almost surely, 2^7987899 is an apocalyptic number.

7987899 is a deficient number, since it is larger than the sum of its proper divisors (2676613).

7987899 is a wasteful number, since it uses less digits than its factorization.

7987899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3497.

The product of its digits is 2286144, while the sum is 57.

The square root of 7987899 is about 2826.2871404017. The cubic root of 7987899 is about 199.8991074454.

It can be divided in two parts, 79 and 87899, that added together give a palindrome (87978).

The spelling of 7987899 in words is "seven million, nine hundred eighty-seven thousand, eight hundred ninety-nine".