28393839 has 6 divisors (see below), whose sum is σ = 41013336. Its totient is φ = 18929220.

The previous prime is 28393831. The next prime is 28393843. The reversal of 28393839 is 93839382.

It is not a de Polignac number, because 28393839 - 2³ = 28393831 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28393794 and 28393803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28393831) 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 5 ways as a sum of consecutive naturals, for example, 1577427 + ... + 1577444.

It is an arithmetic number, because the mean of its divisors is an integer number (6835556).

Almost surely, 2^28393839 is an apocalyptic number.

28393839 is a deficient number, since it is larger than the sum of its proper divisors (12619497).

28393839 is a wasteful number, since it uses less digits than its factorization.

28393839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3154877 (or 3154874 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 28393839 is about 5328.5869609119. The cubic root of 28393839 is about 305.0759964705.

The spelling of 28393839 in words is "twenty-eight million, three hundred ninety-three thousand, eight hundred thirty-nine".