857728379 has 2 divisors, whose sum is σ = 857728380. Its totient is φ = 857728378.

The previous prime is 857728363. The next prime is 857728393. The reversal of 857728379 is 973827758.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 857728379 - 2⁴ = 857728363 is a prime.

It is not a weakly prime, because it can be changed into another prime (857728349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428864189 + 428864190.

It is an arithmetic number, because the mean of its divisors is an integer number (428864190).

Almost surely, 2^857728379 is an apocalyptic number.

857728379 is a deficient number, since it is larger than the sum of its proper divisors (1).

857728379 is an equidigital number, since it uses as much as digits as its factorization.

857728379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5927040, while the sum is 56.

The square root of 857728379 is about 29287.0001707242. Note that the first 3 decimals coincide. The cubic root of 857728379 is about 950.1305006320.

The spelling of 857728379 in words is "eight hundred fifty-seven million, seven hundred twenty-eight thousand, three hundred seventy-nine".