858985429 has 2 divisors, whose sum is σ = 858985430. Its totient is φ = 858985428.

The previous prime is 858985381. The next prime is 858985441. The reversal of 858985429 is 924589858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 858607204 + 378225 = 29302^2 + 615^2 .

It is a cyclic number.

It is not a de Polignac number, because 858985429 - 2¹⁷ = 858854357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (858985529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429492714 + 429492715.

It is an arithmetic number, because the mean of its divisors is an integer number (429492715).

Almost surely, 2^858985429 is an apocalyptic number.

It is an amenable number.

858985429 is a deficient number, since it is larger than the sum of its proper divisors (1).

858985429 is an equidigital number, since it uses as much as digits as its factorization.

858985429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8294400, while the sum is 58.

The square root of 858985429 is about 29308.4532003994. The cubic root of 858985429 is about 950.5944309318.

The spelling of 858985429 in words is "eight hundred fifty-eight million, nine hundred eighty-five thousand, four hundred twenty-nine".