1155140239 has 4 divisors (see below), whose sum is σ = 1260153000. Its totient is φ = 1050127480.

The previous prime is 1155140237. The next prime is 1155140243. The reversal of 1155140239 is 9320415511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1155140239 - 2¹ = 1155140237 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1155140239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155140237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52506364 + ... + 52506385.

It is an arithmetic number, because the mean of its divisors is an integer number (315038250).

Almost surely, 2^1155140239 is an apocalyptic number.

1155140239 is a deficient number, since it is larger than the sum of its proper divisors (105012761).

1155140239 is a wasteful number, since it uses less digits than its factorization.

1155140239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105012760.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1155140239 is about 33987.3541041370. The cubic root of 1155140239 is about 1049.2482113646.

The spelling of 1155140239 in words is "one billion, one hundred fifty-five million, one hundred forty thousand, two hundred thirty-nine".