1198021 has 6 divisors (see below), whose sum is σ = 1316966. Its totient is φ = 1089000.

The previous prime is 1198013. The next prime is 1198033. The reversal of 1198021 is 1208911.

It can be written as a sum of positive squares in only one way, i.e., 1185921 + 12100 = 1089^2 + 110^2 .

It is not a de Polignac number, because 1198021 - 2³ = 1198013 is a prime.

It is a Duffinian number.

1198021 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1197983 and 1198001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1198051) 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, 4830 + ... + 5071.

2^1198021 is an apocalyptic number.

1198021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1198021 is a deficient number, since it is larger than the sum of its proper divisors (118945).

1198021 is an equidigital number, since it uses as much as digits as its factorization.

1198021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9923 (or 9912 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 1198021 is about 1094.5414565013. The cubic root of 1198021 is about 106.2074080728.

The spelling of 1198021 in words is "one million, one hundred ninety-eight thousand, twenty-one".