2198645 has 4 divisors (see below), whose sum is σ = 2638380. Its totient is φ = 1758912.

The previous prime is 2198617. The next prime is 2198653. The reversal of 2198645 is 5468912.

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 964324 + 1234321 = 982^2 + 1111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2198645 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219860 + ... + 219869.

It is an arithmetic number, because the mean of its divisors is an integer number (659595).

2^2198645 is an apocalyptic number.

It is an amenable number.

2198645 is a deficient number, since it is larger than the sum of its proper divisors (439735).

2198645 is an equidigital number, since it uses as much as digits as its factorization.

2198645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439734.

The product of its digits is 17280, while the sum is 35.

The square root of 2198645 is about 1482.7828566584. The cubic root of 2198645 is about 130.0324376648.

The spelling of 2198645 in words is "two million, one hundred ninety-eight thousand, six hundred forty-five".