858538921 has 8 divisors (see below), whose sum is σ = 910229600. Its totient is φ = 807498720.

The previous prime is 858538909. The next prime is 858538943. The reversal of 858538921 is 129835858.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 858538921 - 2⁹ = 858538409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (858538951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159900 + ... + 165181.

It is an arithmetic number, because the mean of its divisors is an integer number (113778700).

Almost surely, 2^858538921 is an apocalyptic number.

It is an amenable number.

858538921 is a deficient number, since it is larger than the sum of its proper divisors (51690679).

858538921 is a wasteful number, since it uses less digits than its factorization.

858538921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325239.

The product of its digits is 691200, while the sum is 49.

The square root of 858538921 is about 29300.8348174587. The cubic root of 858538921 is about 950.4296933359.

The spelling of 858538921 in words is "eight hundred fifty-eight million, five hundred thirty-eight thousand, nine hundred twenty-one".