2198779 has 4 divisors (see below), whose sum is σ = 2398680. Its totient is φ = 1998880.

The previous prime is 2198767. The next prime is 2198783. The reversal of 2198779 is 9778912.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2198779 - 2⁵ = 2198747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2198759) 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, 99934 + ... + 99955.

It is an arithmetic number, because the mean of its divisors is an integer number (599670).

2^2198779 is an apocalyptic number.

2198779 is a deficient number, since it is larger than the sum of its proper divisors (199901).

2198779 is a wasteful number, since it uses less digits than its factorization.

2198779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199900.

The product of its digits is 63504, while the sum is 43.

The square root of 2198779 is about 1482.8280412779. The cubic root of 2198779 is about 130.0350792907.

It can be divided in two parts, 219 and 8779, that added together give a palindrome (8998).

The spelling of 2198779 in words is "two million, one hundred ninety-eight thousand, seven hundred seventy-nine".