1165640142 has 16 divisors (see below), whose sum is σ = 2339240400. Its totient is φ = 387220032.

The previous prime is 1165640117. The next prime is 1165640149. The reversal of 1165640142 is 2410465611.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165640149) 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, 329767 + ... + 333282.

It is an arithmetic number, because the mean of its divisors is an integer number (146202525).

Almost surely, 2^1165640142 is an apocalyptic number.

1165640142 is an abundant number, since it is smaller than the sum of its proper divisors (1173600258).

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

1165640142 is a wasteful number, since it uses less digits than its factorization.

1165640142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663347.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 1165640142 is about 34141.4724638525. The cubic root of 1165640142 is about 1052.4177519170.

The spelling of 1165640142 in words is "one billion, one hundred sixty-five million, six hundred forty thousand, one hundred forty-two".