2238309 has 6 divisors (see below), whose sum is σ = 3233126. Its totient is φ = 1492200.

The previous prime is 2238289. The next prime is 2238311. The reversal of 2238309 is 9038322.

It can be written as a sum of positive squares in only one way, i.e., 2022084 + 216225 = 1422^2 + 465^2 .

It is not a de Polignac number, because 2238309 - 2⁵ = 2238277 is a prime.

It is a Duffinian number.

2238309 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2238319) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 124342 + ... + 124359.

2^2238309 is an apocalyptic number.

It is an amenable number.

2238309 is a deficient number, since it is larger than the sum of its proper divisors (994817).

2238309 is a wasteful number, since it uses less digits than its factorization.

2238309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248707 (or 248704 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 2238309 is about 1496.0979246025. The cubic root of 2238309 is about 130.8097192789.

The spelling of 2238309 in words is "two million, two hundred thirty-eight thousand, three hundred nine".