858138436 has 27 divisors (see below), whose sum is σ = 1527499197. Its totient is φ = 421833600.

The previous prime is 858138431. The next prime is 858138443. The reversal of 858138436 is 634831858.

The square root of 858138436 is 29294.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 385336900 + 472801536 = 19630^2 + 21744^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (858138431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5682961 + ... + 5683111.

Almost surely, 2^858138436 is an apocalyptic number.

858138436 is the 29294-th square number.

It is an amenable number.

858138436 is a deficient number, since it is larger than the sum of its proper divisors (669360761).

858138436 is an equidigital number, since it uses as much as digits as its factorization.

858138436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500 (or 250 counting only the distinct ones).

The product of its digits is 552960, while the sum is 46.

The cubic root of 858138436 is about 950.2818871710.

It can be divided in two parts, 85813 and 8436, that added together give a palindrome (94249).

The spelling of 858138436 in words is "eight hundred fifty-eight million, one hundred thirty-eight thousand, four hundred thirty-six".