2198641 has 4 divisors (see below), whose sum is σ = 2218212. Its totient is φ = 2179072.

The previous prime is 2198617. The next prime is 2198653. The reversal of 2198641 is 1468912.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 758641 + 1440000 = 871^2 + 1200^2 .

It is a cyclic number.

It is not a de Polignac number, because 2198641 - 2⁷ = 2198513 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2198671) 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, 9616 + ... + 9841.

It is an arithmetic number, because the mean of its divisors is an integer number (554553).

2^2198641 is an apocalyptic number.

It is an amenable number.

2198641 is a deficient number, since it is larger than the sum of its proper divisors (19571).

2198641 is a wasteful number, since it uses less digits than its factorization.

2198641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19570.

The product of its digits is 3456, while the sum is 31.

The square root of 2198641 is about 1482.7815078426. The cubic root of 2198641 is about 130.0323588087.

The spelling of 2198641 in words is "two million, one hundred ninety-eight thousand, six hundred forty-one".