865499040 has 192 divisors, whose sum is σ = 3462117120. Its totient is φ = 197821440.

The previous prime is 865498973. The next prime is 865499051. The reversal of 865499040 is 40994568.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 15930 + ... + 44550.

It is an arithmetic number, because the mean of its divisors is an integer number (18031860).

Almost surely, 2^865499040 is an apocalyptic number.

865499040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 865499040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1731058560).

865499040 is an abundant number, since it is smaller than the sum of its proper divisors (2596618080).

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

865499040 is a wasteful number, since it uses less digits than its factorization.

865499040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28652 (or 28638 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 865499040 is about 29419.3650509320. The cubic root of 865499040 is about 952.9911410904.

The spelling of 865499040 in words is "eight hundred sixty-five million, four hundred ninety-nine thousand, forty".