28340139 has 16 divisors (see below), whose sum is σ = 40943232. Its totient is φ = 17367168.

The previous prime is 28340131. The next prime is 28340149. The reversal of 28340139 is 93104382.

It is not a de Polignac number, because 28340139 - 2³ = 28340131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28340131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4269 + ... + 8654.

It is an arithmetic number, because the mean of its divisors is an integer number (2558952).

Almost surely, 2^28340139 is an apocalyptic number.

28340139 is a deficient number, since it is larger than the sum of its proper divisors (12603093).

28340139 is a wasteful number, since it uses less digits than its factorization.

28340139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12986.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 28340139 is about 5323.5457169071. The cubic root of 28340139 is about 304.8835495603.

The spelling of 28340139 in words is "twenty-eight million, three hundred forty thousand, one hundred thirty-nine".