865859358 has 64 divisors (see below), whose sum is σ = 2163248640. Its totient is φ = 224940672.

The previous prime is 865859341. The next prime is 865859359. The reversal of 865859358 is 853958568.

It is a junction number, because it is equal to n+sod(n) for n = 865859298 and 865859307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865859359) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24748 + ... + 48416.

It is an arithmetic number, because the mean of its divisors is an integer number (33800760).

Almost surely, 2^865859358 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 865859358, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1081624320).

865859358 is an abundant number, since it is smaller than the sum of its proper divisors (1297389282).

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

865859358 is a wasteful number, since it uses less digits than its factorization.

865859358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23761.

The product of its digits is 10368000, while the sum is 57.

The square root of 865859358 is about 29425.4882372409. The cubic root of 865859358 is about 953.1233700920.

The spelling of 865859358 in words is "eight hundred sixty-five million, eight hundred fifty-nine thousand, three hundred fifty-eight".