865332540 has 144 divisors (see below), whose sum is σ = 2674788480. Its totient is φ = 226416000.

The previous prime is 865332509. The next prime is 865332541. The reversal of 865332540 is 45233568.

It is a happy number.

865332540 is a `hidden beast` number, since 86 + 5 + 3 + 32 + 540 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 865332495 and 865332504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865332541) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3447415 + ... + 3447665.

It is an arithmetic number, because the mean of its divisors is an integer number (18574920).

Almost surely, 2^865332540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 865332540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1337394240).

865332540 is an abundant number, since it is smaller than the sum of its proper divisors (1809455940).

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

865332540 is a wasteful number, since it uses less digits than its factorization.

865332540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552 (or 547 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 865332540 is about 29416.5351460705. The cubic root of 865332540 is about 952.9300267530.

The spelling of 865332540 in words is "eight hundred sixty-five million, three hundred thirty-two thousand, five hundred forty".