28040439 has 8 divisors (see below), whose sum is σ = 42728320. Its totient is φ = 16023096.

The previous prime is 28040437. The next prime is 28040443. The reversal of 28040439 is 93404082.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28040439 - 2¹ = 28040437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28040431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 667609 + ... + 667650.

It is an arithmetic number, because the mean of its divisors is an integer number (5341040).

Almost surely, 2^28040439 is an apocalyptic number.

28040439 is a deficient number, since it is larger than the sum of its proper divisors (14687881).

28040439 is a wasteful number, since it uses less digits than its factorization.

28040439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335269.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 28040439 is about 5295.3223697902. The cubic root of 28040439 is about 303.8050133215.

The spelling of 28040439 in words is "twenty-eight million, forty thousand, four hundred thirty-nine".