7843681 has 4 divisors (see below), whose sum is σ = 8305092. Its totient is φ = 7382272.

The previous prime is 7843679. The next prime is 7843687. The reversal of 7843681 is 1863487.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1863487 = 353 ⋅5279.

It can be written as a sum of positive squares in 2 ways, for example, as 6760000 + 1083681 = 2600^2 + 1041^2 .

It is a cyclic number.

It is not a de Polignac number, because 7843681 - 2¹ = 7843679 is a prime.

It is a super-2 number, since 2×7843681² = 123046663259522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7843681.

It is not an unprimeable number, because it can be changed into a prime (7843687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230680 + ... + 230713.

It is an arithmetic number, because the mean of its divisors is an integer number (2076273).

Almost surely, 2^7843681 is an apocalyptic number.

It is an amenable number.

7843681 is a deficient number, since it is larger than the sum of its proper divisors (461411).

7843681 is a wasteful number, since it uses less digits than its factorization.

7843681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461410.

The product of its digits is 32256, while the sum is 37.

The square root of 7843681 is about 2800.6572442911. The cubic root of 7843681 is about 198.6887637513.

It can be divided in two parts, 784 and 3681, that added together give a triangular number (4465 = T₉₄).

The spelling of 7843681 in words is "seven million, eight hundred forty-three thousand, six hundred eighty-one".