1171857988 has 12 divisors (see below), whose sum is σ = 2343716032. Its totient is φ = 502224840.

The previous prime is 1171857971. The next prime is 1171857997. The reversal of 1171857988 is 8897581711.

1171857988 is an admirable number.

It is a super-2 number, since 2×1171857988² = 2746502288078816288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20926008 + ... + 20926063.

Almost surely, 2^1171857988 is an apocalyptic number.

It is an amenable number.

1171857988 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1171857988 is a wasteful number, since it uses less digits than its factorization.

1171857988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41852082 (or 41852080 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 55.

The square root of 1171857988 is about 34232.4113670071. The cubic root of 1171857988 is about 1054.2857299220.

The spelling of 1171857988 in words is "one billion, one hundred seventy-one million, eight hundred fifty-seven thousand, nine hundred eighty-eight".