858940 has 24 divisors (see below), whose sum is σ = 1833552. Its totient is φ = 337920.

The previous prime is 858931. The next prime is 858943. The reversal of 858940 is 49858.

It is a junction number, because it is equal to n+sod(n) for n = 858896 and 858905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (858943) by changing a digit.

858940 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 7 ways as a sum of consecutive naturals, for example, 1020 + ... + 1660.

It is an arithmetic number, because the mean of its divisors is an integer number (76398).

2⁸⁵⁸⁹⁴⁰ is an apocalyptic number.

It is an amenable number.

858940 is an abundant number, since it is smaller than the sum of its proper divisors (974612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

858940 is a wasteful number, since it uses less digits than its factorization.

858940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717 (or 715 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 858940 is about 926.7901596370. The cubic root of 858940 is about 95.0577672667.

It can be divided in two parts, 85 and 8940, that added together give a square (9025 = 95²).

The spelling of 858940 in words is "eight hundred fifty-eight thousand, nine hundred forty".