1165711720 has 32 divisors (see below), whose sum is σ = 2626331400. Its totient is φ = 465666048.

The previous prime is 1165711699. The next prime is 1165711721. The reversal of 1165711720 is 271175611.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 491686276 + 674025444 = 22174^2 + 25962^2 .

It is not an unprimeable number, because it can be changed into a prime (1165711721) 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, 11812 + ... + 49708.

Almost surely, 2^1165711720 is an apocalyptic number.

1165711720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1165711720 is an abundant number, since it is smaller than the sum of its proper divisors (1460619680).

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

1165711720 is a wasteful number, since it uses less digits than its factorization.

1165711720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38677 (or 38673 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 31.

The square root of 1165711720 is about 34142.5207036622. The cubic root of 1165711720 is about 1052.4392932753.

The spelling of 1165711720 in words is "one billion, one hundred sixty-five million, seven hundred eleven thousand, seven hundred twenty".