7681391 has 8 divisors (see below), whose sum is σ = 8053584. Its totient is φ = 7318080.

The previous prime is 7681369. The next prime is 7681403. The reversal of 7681391 is 1931867.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7681391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7681361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 416 + ... + 3941.

It is an arithmetic number, because the mean of its divisors is an integer number (1006698).

Almost surely, 2^7681391 is an apocalyptic number.

7681391 is a deficient number, since it is larger than the sum of its proper divisors (372193).

7681391 is a wasteful number, since it uses less digits than its factorization.

7681391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4441.

The product of its digits is 9072, while the sum is 35.

The square root of 7681391 is about 2771.5322476926. The cubic root of 7681391 is about 197.3088766892.

The spelling of 7681391 in words is "seven million, six hundred eighty-one thousand, three hundred ninety-one".