865400046 has 64 divisors (see below), whose sum is σ = 2024870400. Its totient is φ = 241464960.

The previous prime is 865400021. The next prime is 865400083. The reversal of 865400046 is 640004568.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 380605 + ... + 382871.

It is an arithmetic number, because the mean of its divisors is an integer number (31638600).

Almost surely, 2^865400046 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 865400046, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1012435200).

865400046 is an abundant number, since it is smaller than the sum of its proper divisors (1159470354).

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

865400046 is a wasteful number, since it uses less digits than its factorization.

865400046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2489.

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 865400046 is about 29417.6825395883. The cubic root of 865400046 is about 952.9548059828.

The spelling of 865400046 in words is "eight hundred sixty-five million, four hundred thousand, forty-six".