858388 has 12 divisors (see below), whose sum is σ = 1530900. Its totient is φ = 420992.

The previous prime is 858373. The next prime is 858397. The reversal of 858388 is 883858.

It can be written as a sum of positive squares in 2 ways, for example, as 412164 + 446224 = 642^2 + 668^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 858388.

It is a congruent number.

It is an unprimeable number.

858388 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1813 + ... + 2236.

It is an arithmetic number, because the mean of its divisors is an integer number (127575).

2⁸⁵⁸³⁸⁸ is an apocalyptic number.

It is an amenable number.

858388 is a deficient number, since it is larger than the sum of its proper divisors (672512).

858388 is a wasteful number, since it uses less digits than its factorization.

858388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4106 (or 4104 counting only the distinct ones).

The product of its digits is 61440, while the sum is 40.

The square root of 858388 is about 926.4923097360. The cubic root of 858388 is about 95.0373998635.

The spelling of 858388 in words is "eight hundred fifty-eight thousand, three hundred eighty-eight".