7827986 has 4 divisors (see below), whose sum is σ = 11741982. Its totient is φ = 3913992.

The previous prime is 7827983. The next prime is 7828033. The reversal of 7827986 is 6897287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6897287 = 349 ⋅19763.

It can be written as a sum of positive squares in only one way, i.e., 5909761 + 1918225 = 2431^2 + 1385^2 .

It is a super-2 number, since 2×7827986² = 122554729632392, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 7827986.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1956995 + ... + 1956998.

Almost surely, 2^7827986 is an apocalyptic number.

7827986 is a deficient number, since it is larger than the sum of its proper divisors (3913996).

7827986 is a wasteful number, since it uses less digits than its factorization.

7827986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3913995.

The product of its digits is 338688, while the sum is 47.

The square root of 7827986 is about 2797.8538203416. The cubic root of 7827986 is about 198.5561515921.

The spelling of 7827986 in words is "seven million, eight hundred twenty-seven thousand, nine hundred eighty-six".