7840386 has 12 divisors (see below), whose sum is σ = 16987542. Its totient is φ = 2613456.

The previous prime is 7840381. The next prime is 7840409. The reversal of 7840386 is 6830487.

It can be written as a sum of positive squares in only one way, i.e., 4347225 + 3493161 = 2085^2 + 1869^2 .

It is a super-2 number, since 2×7840386² = 122943305257992, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7840386.

It is not an unprimeable number, because it can be changed into a prime (7840381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 217771 + ... + 217806.

Almost surely, 2^7840386 is an apocalyptic number.

7840386 is an abundant number, since it is smaller than the sum of its proper divisors (9147156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7840386 is a wasteful number, since it uses less digits than its factorization.

7840386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435585 (or 435582 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 7840386 is about 2800.0689277230. The cubic root of 7840386 is about 198.6609379057.

The spelling of 7840386 in words is "seven million, eight hundred forty thousand, three hundred eighty-six".