7827987 has 4 divisors (see below), whose sum is σ = 10437320. Its totient is φ = 5218656.

The previous prime is 7827983. The next prime is 7828033. The reversal of 7827987 is 7897287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7897287 = 3 ⋅2632429.

It is not a de Polignac number, because 7827987 - 2² = 7827983 is a prime.

It is a super-2 number, since 2×7827987² = 122554760944338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7827983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1304662 + ... + 1304667.

It is an arithmetic number, because the mean of its divisors is an integer number (2609330).

Almost surely, 2^7827987 is an apocalyptic number.

7827987 is a deficient number, since it is larger than the sum of its proper divisors (2609333).

7827987 is a wasteful number, since it uses less digits than its factorization.

7827987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2609332.

The product of its digits is 395136, while the sum is 48.

The square root of 7827987 is about 2797.8539990500. The cubic root of 7827987 is about 198.5561600471.

The spelling of 7827987 in words is "seven million, eight hundred twenty-seven thousand, nine hundred eighty-seven".