1191808 has 16 divisors (see below), whose sum is σ = 2374560. Its totient is φ = 595840.

The previous prime is 1191793. The next prime is 1191809. The reversal of 1191808 is 8081911.

It is a tau number, because it is divible by the number of its divisors (16).

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4528 + ... + 4783.

It is an arithmetic number, because the mean of its divisors is an integer number (148410).

2^1191808 is an apocalyptic number.

It is an amenable number.

1191808 is a deficient number, since it is larger than the sum of its proper divisors (1182752).

1191808 is an frugal number, since it uses more digits than its factorization.

1191808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9325 (or 9313 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 28.

The square root of 1191808 is about 1091.6995923788. The cubic root of 1191808 is about 106.0234906998.

It can be divided in two parts, 11 and 91808, that added together give a palindrome (91819).

The spelling of 1191808 in words is "one million, one hundred ninety-one thousand, eight hundred eight".