1165356540 has 144 divisors (see below), whose sum is σ = 3639767040. Its totient is φ = 301656960.

The previous prime is 1165356509. The next prime is 1165356541. The reversal of 1165356540 is 456535611.

1165356540 is a `hidden beast` number, since 1 + 1 + 6 + 53 + 565 + 40 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 1165356495 and 1165356504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165356541) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1175445 + ... + 1176435.

It is an arithmetic number, because the mean of its divisors is an integer number (25276160).

Almost surely, 2^1165356540 is an apocalyptic number.

1165356540 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 1165356540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1819883520).

1165356540 is an abundant number, since it is smaller than the sum of its proper divisors (2474410500).

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

1165356540 is a wasteful number, since it uses less digits than its factorization.

1165356540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192 (or 1187 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 1165356540 is about 34137.3188753891. The cubic root of 1165356540 is about 1052.3323933866.

The spelling of 1165356540 in words is "one billion, one hundred sixty-five million, three hundred fifty-six thousand, five hundred forty".