28443983 has 4 divisors (see below), whose sum is σ = 29424840. Its totient is φ = 27463128.

The previous prime is 28443973. The next prime is 28443991. The reversal of 28443983 is 38934482.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38934482 = 2 ⋅19467241.

It is a cyclic number.

It is not a de Polignac number, because 28443983 - 2⁴ = 28443967 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28443983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28443913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 490385 + ... + 490442.

It is an arithmetic number, because the mean of its divisors is an integer number (7356210).

Almost surely, 2^28443983 is an apocalyptic number.

28443983 is a deficient number, since it is larger than the sum of its proper divisors (980857).

28443983 is an equidigital number, since it uses as much as digits as its factorization.

28443983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980856.

The product of its digits is 165888, while the sum is 41.

The square root of 28443983 is about 5333.2900727412. The cubic root of 28443983 is about 305.2554806448.

The spelling of 28443983 in words is "twenty-eight million, four hundred forty-three thousand, nine hundred eighty-three".