7681939 has 2 divisors, whose sum is σ = 7681940. Its totient is φ = 7681938.

The previous prime is 7681937. The next prime is 7681969. The reversal of 7681939 is 9391867.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7681939 - 2¹ = 7681937 is a prime.

Together with 7681937, it forms a pair of twin primes.

7681939 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 7681895 and 7681904.

It is not a weakly prime, because it can be changed into another prime (7681937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3840969 + 3840970.

It is an arithmetic number, because the mean of its divisors is an integer number (3840970).

Almost surely, 2^7681939 is an apocalyptic number.

7681939 is a deficient number, since it is larger than the sum of its proper divisors (1).

7681939 is an equidigital number, since it uses as much as digits as its factorization.

7681939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 43.

The square root of 7681939 is about 2771.6311082105. The cubic root of 7681939 is about 197.3135686646.

The spelling of 7681939 in words is "seven million, six hundred eighty-one thousand, nine hundred thirty-nine".