1191977764 has 12 divisors (see below), whose sum is σ = 2088984688. Its totient is φ = 595125000.

The previous prime is 1191977719. The next prime is 1191977803. The reversal of 1191977764 is 4677791911.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212862 + ... + 218389.

Almost surely, 2^1191977764 is an apocalyptic number.

It is an amenable number.

1191977764 is a deficient number, since it is larger than the sum of its proper divisors (897006924).

1191977764 is a wasteful number, since it uses less digits than its factorization.

1191977764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431946 (or 431944 counting only the distinct ones).

The product of its digits is 666792, while the sum is 52.

The square root of 1191977764 is about 34525.0309775386. The cubic root of 1191977764 is about 1060.2852454124.

The spelling of 1191977764 in words is "one billion, one hundred ninety-one million, nine hundred seventy-seven thousand, seven hundred sixty-four".