7938681 has 4 divisors (see below), whose sum is σ = 10584912. Its totient is φ = 5292452.

The previous prime is 7938649. The next prime is 7938727. The reversal of 7938681 is 1868397.

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.

It is a cyclic number.

It is not a de Polignac number, because 7938681 - 2⁵ = 7938649 is a prime.

It is a super-2 number, since 2×7938681² = 126045312039522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7938641) 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, 1323111 + ... + 1323116.

It is an arithmetic number, because the mean of its divisors is an integer number (2646228).

Almost surely, 2^7938681 is an apocalyptic number.

It is an amenable number.

7938681 is a deficient number, since it is larger than the sum of its proper divisors (2646231).

7938681 is a wasteful number, since it uses less digits than its factorization.

7938681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2646230.

The product of its digits is 72576, while the sum is 42.

The square root of 7938681 is about 2817.5665032080. The cubic root of 7938681 is about 199.4876971829.

The spelling of 7938681 in words is "seven million, nine hundred thirty-eight thousand, six hundred eighty-one".