4423991 has 8 divisors (see below), whose sum is σ = 5197584. Its totient is φ = 3712320.

The previous prime is 4423987. The next prime is 4423999. The reversal of 4423991 is 1993244.

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 4423991 - 2² = 4423987 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4423999) 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, 15326 + ... + 15611.

It is an arithmetic number, because the mean of its divisors is an integer number (649698).

Almost surely, 2^4423991 is an apocalyptic number.

4423991 is a deficient number, since it is larger than the sum of its proper divisors (773593).

4423991 is a wasteful number, since it uses less digits than its factorization.

4423991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30961.

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

The square root of 4423991 is about 2103.3285525566. The cubic root of 4423991 is about 164.1615377419.

The spelling of 4423991 in words is "four million, four hundred twenty-three thousand, nine hundred ninety-one".