28939239 has 12 divisors (see below), whose sum is σ = 47772816. Its totient is φ = 16536672.

The previous prime is 28939231. The next prime is 28939259. The reversal of 28939239 is 93293982.

It is not a de Polignac number, because 28939239 - 2³ = 28939231 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28939194 and 28939203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28939231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 229614 + ... + 229739.

It is an arithmetic number, because the mean of its divisors is an integer number (3981068).

Almost surely, 2^28939239 is an apocalyptic number.

28939239 is a deficient number, since it is larger than the sum of its proper divisors (18833577).

28939239 is a wasteful number, since it uses less digits than its factorization.

28939239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459366 (or 459363 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 28939239 is about 5379.5203317768. The cubic root of 28939239 is about 307.0169612234.

The spelling of 28939239 in words is "twenty-eight million, nine hundred thirty-nine thousand, two hundred thirty-nine".