2198578 has 4 divisors (see below), whose sum is σ = 3297870. Its totient is φ = 1099288.

The previous prime is 2198569. The next prime is 2198591. The reversal of 2198578 is 8758912.

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

It can be written as a sum of positive squares in only one way, i.e., 1375929 + 822649 = 1173^2 + 907^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 2198578.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549643 + ... + 549646.

2^2198578 is an apocalyptic number.

2198578 is a deficient number, since it is larger than the sum of its proper divisors (1099292).

2198578 is a wasteful number, since it uses less digits than its factorization.

2198578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099291.

The product of its digits is 40320, while the sum is 40.

The square root of 2198578 is about 1482.7602638323. The cubic root of 2198578 is about 130.0311168116.

The spelling of 2198578 in words is "two million, one hundred ninety-eight thousand, five hundred seventy-eight".