7840681 has 4 divisors (see below), whose sum is σ = 8007552. Its totient is φ = 7673812.

The previous prime is 7840667. The next prime is 7840691. The reversal of 7840681 is 1860487.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1860487 = 1361 ⋅1367.

It is a cyclic number.

It is not a de Polignac number, because 7840681 - 2⁵ = 7840649 is a prime.

It is a super-2 number, since 2×7840681² = 122952557087522, which contains 22 as substring.

It is a Duffinian number.

7840681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7840691) 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, 83365 + ... + 83458.

It is an arithmetic number, because the mean of its divisors is an integer number (2001888).

Almost surely, 2^7840681 is an apocalyptic number.

It is an amenable number.

7840681 is a deficient number, since it is larger than the sum of its proper divisors (166871).

7840681 is a wasteful number, since it uses less digits than its factorization.

7840681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166870.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 7840681 is about 2800.1216045022. The cubic root of 7840681 is about 198.6634294599.

It can be divided in two parts, 78406 and 81, that added together give a palindrome (78487).

The spelling of 7840681 in words is "seven million, eight hundred forty thousand, six hundred eighty-one".