1165866240 has 288 divisors, whose sum is σ = 4643444736. Its totient is φ = 242196480.

The previous prime is 1165866217. The next prime is 1165866241. The reversal of 1165866240 is 426685611.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165866241) 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, 293709 + ... + 297651.

It is an arithmetic number, because the mean of its divisors is an integer number (16123072).

Almost surely, 2^1165866240 is an apocalyptic number.

1165866240 is a gapful number since it is divisible by the number (10) 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 1165866240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2321722368).

1165866240 is an abundant number, since it is smaller than the sum of its proper divisors (3477578496).

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

1165866240 is a wasteful number, since it uses less digits than its factorization.

1165866240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3985 (or 3971 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 1165866240 is about 34144.7834961653. The cubic root of 1165866240 is about 1052.4857929750.

The spelling of 1165866240 in words is "one billion, one hundred sixty-five million, eight hundred sixty-six thousand, two hundred forty".