830720879 has 2 divisors, whose sum is σ = 830720880. Its totient is φ = 830720878.

The previous prime is 830720867. The next prime is 830720881. The reversal of 830720879 is 978027038.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-830720879 is a prime.

Together with 830720881, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (830720819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415360439 + 415360440.

It is an arithmetic number, because the mean of its divisors is an integer number (415360440).

Almost surely, 2^830720879 is an apocalyptic number.

830720879 is a deficient number, since it is larger than the sum of its proper divisors (1).

830720879 is an equidigital number, since it uses as much as digits as its factorization.

830720879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 830720879 is about 28822.2289040941. The cubic root of 830720879 is about 940.0516340280.

The spelling of 830720879 in words is "eight hundred thirty million, seven hundred twenty thousand, eight hundred seventy-nine".