2239991 has 4 divisors (see below), whose sum is σ = 2412312. Its totient is φ = 2067672.

The previous prime is 2239987. The next prime is 2239997. The reversal of 2239991 is 1999322.

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 2239991 - 2² = 2239987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2239997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86141 + ... + 86166.

It is an arithmetic number, because the mean of its divisors is an integer number (603078).

2^2239991 is an apocalyptic number.

2239991 is a deficient number, since it is larger than the sum of its proper divisors (172321).

2239991 is a wasteful number, since it uses less digits than its factorization.

2239991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172320.

The product of its digits is 8748, while the sum is 35.

The square root of 2239991 is about 1496.6599480176. The cubic root of 2239991 is about 130.8424771716.

The spelling of 2239991 in words is "two million, two hundred thirty-nine thousand, nine hundred ninety-one".