2239861 has 4 divisors (see below), whose sum is σ = 2412172. Its totient is φ = 2067552.

The previous prime is 2239847. The next prime is 2239883. The reversal of 2239861 is 1689322.

2239861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 93636 + 2146225 = 306^2 + 1465^2 .

It is a cyclic number.

It is not a de Polignac number, because 2239861 - 2¹¹ = 2237813 is a prime.

It is a d-powerful number, because it can be written as 2¹¹ + 2²¹ + 3⁷ + 9⁵ + 8⁵ + 6⁶ + 1 .

It is a Duffinian number.

2239861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2239361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86136 + ... + 86161.

It is an arithmetic number, because the mean of its divisors is an integer number (603043).

2^2239861 is an apocalyptic number.

It is an amenable number.

2239861 is a deficient number, since it is larger than the sum of its proper divisors (172311).

2239861 is a wasteful number, since it uses less digits than its factorization.

2239861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172310.

The product of its digits is 5184, while the sum is 31.

The square root of 2239861 is about 1496.6165173484. The cubic root of 2239861 is about 130.8399459336.

The spelling of 2239861 in words is "two million, two hundred thirty-nine thousand, eight hundred sixty-one".