858742 has 8 divisors (see below), whose sum is σ = 1297800. Its totient is φ = 426144.

The previous prime is 858713. The next prime is 858749. The reversal of 858742 is 247858.

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

It is a junction number, because it is equal to n+sod(n) for n = 858698 and 858707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (858749) by changing a digit.

858742 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1267 + ... + 1822.

It is an arithmetic number, because the mean of its divisors is an integer number (162225).

2⁸⁵⁸⁷⁴² is an apocalyptic number.

858742 is a deficient number, since it is larger than the sum of its proper divisors (439058).

858742 is a wasteful number, since it uses less digits than its factorization.

858742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3230.

The product of its digits is 17920, while the sum is 34.

The square root of 858742 is about 926.6833331835. The cubic root of 858742 is about 95.0504625716.

It can be divided in two parts, 858 and 742, that multiplied together give a palindrome (636636).

The spelling of 858742 in words is "eight hundred fifty-eight thousand, seven hundred forty-two".