2209819 has 4 divisors (see below), whose sum is σ = 2224800. Its totient is φ = 2194840.

The previous prime is 2209811. The next prime is 2209841. The reversal of 2209819 is 9189022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9189022 = 2 ⋅4594511.

It is a cyclic number.

It is not a de Polignac number, because 2209819 - 2³ = 2209811 is a prime.

It is a super-2 number, since 2×2209819² = 9766600025522, which contains 22 as substring.

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 (2209811) 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, 7267 + ... + 7564.

It is an arithmetic number, because the mean of its divisors is an integer number (556200).

2^2209819 is an apocalyptic number.

2209819 is a deficient number, since it is larger than the sum of its proper divisors (14981).

2209819 is a wasteful number, since it uses less digits than its factorization.

2209819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14980.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 2209819 is about 1486.5459965975. The cubic root of 2209819 is about 130.2523500693.

The spelling of 2209819 in words is "two million, two hundred nine thousand, eight hundred nineteen".