1198981 has 6 divisors (see below), whose sum is σ = 1394790. Its totient is φ = 1027656.

The previous prime is 1198979. The next prime is 1198991. The reversal of 1198981 is 1898911.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 828100 + 370881 = 910^2 + 609^2 .

It is not a de Polignac number, because 1198981 - 2¹ = 1198979 is a prime.

It is a super-2 number, since 2×1198981² = 2875110876722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1198981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1198991) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12186 + ... + 12283.

It is an arithmetic number, because the mean of its divisors is an integer number (232465).

2^1198981 is an apocalyptic number.

It is an amenable number.

1198981 is a deficient number, since it is larger than the sum of its proper divisors (195809).

1198981 is an equidigital number, since it uses as much as digits as its factorization.

1198981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24483 (or 24476 counting only the distinct ones).

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

The square root of 1198981 is about 1094.9799084915. The cubic root of 1198981 is about 106.2357692590.

The spelling of 1198981 in words is "one million, one hundred ninety-eight thousand, nine hundred eighty-one".