2443991 has 8 divisors (see below), whose sum is σ = 2728704. Its totient is φ = 2169720.

The previous prime is 2443963. The next prime is 2443993. The reversal of 2443991 is 1993442.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2443991 - 2⁶ = 2443927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2443993) 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, 2111 + ... + 3056.

It is an arithmetic number, because the mean of its divisors is an integer number (341088).

2^2443991 is an apocalyptic number.

2443991 is a deficient number, since it is larger than the sum of its proper divisors (284713).

2443991 is a wasteful number, since it uses less digits than its factorization.

2443991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5221.

The product of its digits is 7776, while the sum is 32.

The square root of 2443991 is about 1563.3269011950. The cubic root of 2443991 is about 134.6996707276.

The spelling of 2443991 in words is "two million, four hundred forty-three thousand, nine hundred ninety-one".