1198891 has 8 divisors (see below), whose sum is σ = 1283040. Its totient is φ = 1116288.

The previous prime is 1198877. The next prime is 1198903. The reversal of 1198891 is 1988911.

It is a happy number.

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

It is not a de Polignac number, because 1198891 - 2¹¹ = 1196843 is a prime.

It is a Duffinian number.

1198891 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1198891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1198811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1530 + ... + 2176.

It is an arithmetic number, because the mean of its divisors is an integer number (160380).

2^1198891 is an apocalyptic number.

1198891 is the 693-rd centered pentagonal number.

1198891 is a deficient number, since it is larger than the sum of its proper divisors (84149).

1198891 is a wasteful number, since it uses less digits than its factorization.

1198891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773.

The product of its digits is 5184, while the sum is 37.

The square root of 1198891 is about 1094.9388110758. The cubic root of 1198891 is about 106.2331110410.

It can be divided in two parts, 11 and 98891, that multiplied together give a palindrome (1087801).

The spelling of 1198891 in words is "one million, one hundred ninety-eight thousand, eight hundred ninety-one".