1165688040 has 256 divisors, whose sum is σ = 4011171840. Its totient is φ = 268416000.

The previous prime is 1165688039. The next prime is 1165688053. The reversal of 1165688040 is 408865611.

It is a self number, because there is not a number n which added to its sum of digits gives 1165688040.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2495887 + ... + 2496353.

It is an arithmetic number, because the mean of its divisors is an integer number (15668640).

Almost surely, 2^1165688040 is an apocalyptic number.

1165688040 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 1165688040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2005585920).

1165688040 is an abundant number, since it is smaller than the sum of its proper divisors (2845483800).

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

1165688040 is a wasteful number, since it uses less digits than its factorization.

1165688040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584 (or 580 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 1165688040 is about 34142.1739202412. The cubic root of 1165688040 is about 1052.4321668904.

The spelling of 1165688040 in words is "one billion, one hundred sixty-five million, six hundred eighty-eight thousand, forty".