2278209 has 8 divisors (see below), whose sum is σ = 3065920. Its totient is φ = 1504656.

The previous prime is 2278207. The next prime is 2278217. The reversal of 2278209 is 9028722.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2278209 - 2¹ = 2278207 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2278207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3157 + ... + 3810.

It is an arithmetic number, because the mean of its divisors is an integer number (383240).

2^2278209 is an apocalyptic number.

It is an amenable number.

2278209 is a deficient number, since it is larger than the sum of its proper divisors (787711).

2278209 is a wasteful number, since it uses less digits than its factorization.

2278209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7079.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 2278209 is about 1509.3737111796. The cubic root of 2278209 is about 131.5824154342.

The spelling of 2278209 in words is "two million, two hundred seventy-eight thousand, two hundred nine".