1165440 has 64 divisors (see below), whose sum is σ = 3720960. Its totient is φ = 310272.

The previous prime is 1165421. The next prime is 1165447. The reversal of 1165440 is 445611.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (1165447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1617 + ... + 2223.

It is an arithmetic number, because the mean of its divisors is an integer number (58140).

2^1165440 is an apocalyptic number.

1165440 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 1165440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1860480).

1165440 is an abundant number, since it is smaller than the sum of its proper divisors (2555520).

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

1165440 is an equidigital number, since it uses as much as digits as its factorization.

1165440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629 (or 617 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1165440 is about 1079.5554640684. Note that the first 3 decimals coincide. The cubic root of 1165440 is about 105.2357514615.

The spelling of 1165440 in words is "one million, one hundred sixty-five thousand, four hundred forty".