1165808520 has 48 divisors (see below), whose sum is σ = 3788878860. Its totient is φ = 310882176.

The previous prime is 1165808513. The next prime is 1165808531. The reversal of 1165808520 is 258085611.

It can be written as a sum of positive squares in 2 ways, for example, as 1112489316 + 53319204 = 33354^2 + 7302^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1618819 + ... + 1619538.

Almost surely, 2^1165808520 is an apocalyptic number.

1165808520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1165808520 is an abundant number, since it is smaller than the sum of its proper divisors (2623070340).

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

1165808520 is a wasteful number, since it uses less digits than its factorization.

1165808520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3238374 (or 3238367 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

The square root of 1165808520 is about 34143.9382614250. The cubic root of 1165808520 is about 1052.4684237776.

The spelling of 1165808520 in words is "one billion, one hundred sixty-five million, eight hundred eight thousand, five hundred twenty".