857507389 has 2 divisors, whose sum is σ = 857507390. Its totient is φ = 857507388.

The previous prime is 857507369. The next prime is 857507423. The reversal of 857507389 is 983705758.

857507389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 707028100 + 150479289 = 26590^2 + 12267^2 .

It is a cyclic number.

It is not a de Polignac number, because 857507389 - 2²⁷ = 723289661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857507359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428753694 + 428753695.

It is an arithmetic number, because the mean of its divisors is an integer number (428753695).

Almost surely, 2^857507389 is an apocalyptic number.

It is an amenable number.

857507389 is a deficient number, since it is larger than the sum of its proper divisors (1).

857507389 is an equidigital number, since it uses as much as digits as its factorization.

857507389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2116800, while the sum is 52.

The square root of 857507389 is about 29283.2270933379. The cubic root of 857507389 is about 950.0488946210.

It can be divided in two parts, 85750 and 7389, that added together give a palindrome (93139).

The spelling of 857507389 in words is "eight hundred fifty-seven million, five hundred seven thousand, three hundred eighty-nine".