1191998 has 8 divisors (see below), whose sum is σ = 1865808. Its totient is φ = 570064.

The previous prime is 1191991. The next prime is 1192013. The reversal of 1191998 is 8991911.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12911 + ... + 13002.

It is an arithmetic number, because the mean of its divisors is an integer number (233226).

2^1191998 is an apocalyptic number.

1191998 is a deficient number, since it is larger than the sum of its proper divisors (673810).

1191998 is a wasteful number, since it uses less digits than its factorization.

1191998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25938.

The product of its digits is 5832, while the sum is 38.

The square root of 1191998 is about 1091.7866091870. The cubic root of 1191998 is about 106.0291245471.

The spelling of 1191998 in words is "one million, one hundred ninety-one thousand, nine hundred ninety-eight".