11998205 has 4 divisors (see below), whose sum is σ = 14397852. Its totient is φ = 9598560.

The previous prime is 11998201. The next prime is 11998213. The reversal of 11998205 is 50289911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50289911 = 7 ⋅7184273.

It can be written as a sum of positive squares in 2 ways, for example, as 5331481 + 6666724 = 2309^2 + 2582^2 .

It is not a de Polignac number, because 11998205 - 2² = 11998201 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11998201) 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, 1199816 + ... + 1199825.

It is an arithmetic number, because the mean of its divisors is an integer number (3599463).

Almost surely, 2^11998205 is an apocalyptic number.

It is an amenable number.

11998205 is a deficient number, since it is larger than the sum of its proper divisors (2399647).

11998205 is an equidigital number, since it uses as much as digits as its factorization.

11998205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2399646.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 11998205 is about 3463.8425195150. The cubic root of 11998205 is about 228.9314325966.

The spelling of 11998205 in words is "eleven million, nine hundred ninety-eight thousand, two hundred five".