1191688 has 8 divisors (see below), whose sum is σ = 2234430. Its totient is φ = 595840.

The previous prime is 1191679. The next prime is 1191691. The reversal of 1191688 is 8861911.

It can be written as a sum of positive squares in only one way, i.e., 1077444 + 114244 = 1038^2 + 338^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74473 + ... + 74488.

2^1191688 is an apocalyptic number.

It is an amenable number.

1191688 is a deficient number, since it is larger than the sum of its proper divisors (1042742).

1191688 is a wasteful number, since it uses less digits than its factorization.

1191688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148967 (or 148963 counting only the distinct ones).

The product of its digits is 3456, while the sum is 34.

The square root of 1191688 is about 1091.6446308209. The cubic root of 1191688 is about 106.0199321720.

The spelling of 1191688 in words is "one million, one hundred ninety-one thousand, six hundred eighty-eight".