1165640 has 64 divisors (see below), whose sum is σ = 3144960. Its totient is φ = 380160.

The previous prime is 1165583. The next prime is 1165643. The reversal of 1165640 is 465611.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6350 + ... + 6530.

It is an arithmetic number, because the mean of its divisors is an integer number (49140).

2^1165640 is an apocalyptic number.

1165640 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 1165640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1572480).

1165640 is an abundant number, since it is smaller than the sum of its proper divisors (1979320).

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

1165640 is a wasteful number, since it uses less digits than its factorization.

1165640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1165640 is about 1079.6480908148. The cubic root of 1165640 is about 105.2417709181.

The spelling of 1165640 in words is "one million, one hundred sixty-five thousand, six hundred forty".