1172987885 has 8 divisors (see below), whose sum is σ = 1407774816. Its totient is φ = 938264080.

The previous prime is 1172987867. The next prime is 1172987887. The reversal of 1172987885 is 5887892711.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1172987885 - 2³⁰ = 99246061 is a prime.

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 1172987885.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1172987887) 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, 50150 + ... + 69720.

It is an arithmetic number, because the mean of its divisors is an integer number (175971852).

Almost surely, 2^1172987885 is an apocalyptic number.

It is an amenable number.

1172987885 is a deficient number, since it is larger than the sum of its proper divisors (234786931).

1172987885 is a wasteful number, since it uses less digits than its factorization.

1172987885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31563.

The product of its digits is 2257920, while the sum is 56.

The square root of 1172987885 is about 34248.9107126052. The cubic root of 1172987885 is about 1054.6244659693.

The spelling of 1172987885 in words is "one billion, one hundred seventy-two million, nine hundred eighty-seven thousand, eight hundred eighty-five".