28339943 has 4 divisors (see below), whose sum is σ = 28359048. Its totient is φ = 28320840.

The previous prime is 28339937. The next prime is 28339951. The reversal of 28339943 is 34993382.

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 28339943 - 2⁶ = 28339879 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 28339943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28339973) 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, 7121 + ... + 10362.

It is an arithmetic number, because the mean of its divisors is an integer number (7089762).

Almost surely, 2^28339943 is an apocalyptic number.

28339943 is a deficient number, since it is larger than the sum of its proper divisors (19105).

28339943 is a wasteful number, since it uses less digits than its factorization.

28339943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19104.

The product of its digits is 139968, while the sum is 41.

The square root of 28339943 is about 5323.5273080919. The cubic root of 28339943 is about 304.8828467019.

The spelling of 28339943 in words is "twenty-eight million, three hundred thirty-nine thousand, nine hundred forty-three".