1191388 has 12 divisors (see below), whose sum is σ = 2274552. Its totient is φ = 541520.

The previous prime is 1191373. The next prime is 1191409. The reversal of 1191388 is 8831911.

It is a congruent number.

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, 13495 + ... + 13582.

It is an arithmetic number, because the mean of its divisors is an integer number (189546).

2^1191388 is an apocalyptic number.

It is an amenable number.

1191388 is a deficient number, since it is larger than the sum of its proper divisors (1083164).

1191388 is a wasteful number, since it uses less digits than its factorization.

1191388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27092 (or 27090 counting only the distinct ones).

The product of its digits is 1728, while the sum is 31.

The square root of 1191388 is about 1091.5072148181. The cubic root of 1191388 is about 106.0110348071.

The spelling of 1191388 in words is "one million, one hundred ninety-one thousand, three hundred eighty-eight".