7928939 has 2 divisors, whose sum is σ = 7928940. Its totient is φ = 7928938.

The previous prime is 7928933. The next prime is 7928941. The reversal of 7928939 is 9398297.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7928939 - 2⁴ = 7928923 is a prime.

Together with 7928941, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 7928893 and 7928902.

It is not a weakly prime, because it can be changed into another prime (7928933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3964469 + 3964470.

It is an arithmetic number, because the mean of its divisors is an integer number (3964470).

Almost surely, 2^7928939 is an apocalyptic number.

7928939 is a deficient number, since it is larger than the sum of its proper divisors (1).

7928939 is an equidigital number, since it uses as much as digits as its factorization.

7928939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 47.

The square root of 7928939 is about 2815.8371756904. The cubic root of 7928939 is about 199.4060629398.

The spelling of 7928939 in words is "seven million, nine hundred twenty-eight thousand, nine hundred thirty-nine".