1165861242 has 128 divisors (see below), whose sum is σ = 3356774400. Its totient is φ = 291273408.

The previous prime is 1165861211. The next prime is 1165861247. The reversal of 1165861242 is 2421685611.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1165861197 and 1165861206.

It is not an unprimeable number, because it can be changed into a prime (1165861247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 87123 + ... + 99609.

It is an arithmetic number, because the mean of its divisors is an integer number (26224800).

Almost surely, 2^1165861242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1165861242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1678387200).

1165861242 is an abundant number, since it is smaller than the sum of its proper divisors (2190913158).

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

1165861242 is a wasteful number, since it uses less digits than its factorization.

1165861242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12537 (or 12531 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 1165861242 is about 34144.7103077475. The cubic root of 1165861242 is about 1052.4842889913.

It can be divided in two parts, 11658 and 61242, that added together give a square (72900 = 270²).

The spelling of 1165861242 in words is "one billion, one hundred sixty-five million, eight hundred sixty-one thousand, two hundred forty-two".