28930439 has 4 divisors (see below), whose sum is σ = 29016624. Its totient is φ = 28844256.

The previous prime is 28930361. The next prime is 28930457. The reversal of 28930439 is 93403982.

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 28930439 - 2¹⁶ = 28864903 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 (28930639) 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, 42587 + ... + 43260.

It is an arithmetic number, because the mean of its divisors is an integer number (7254156).

Almost surely, 2^28930439 is an apocalyptic number.

28930439 is a deficient number, since it is larger than the sum of its proper divisors (86185).

28930439 is an equidigital number, since it uses as much as digits as its factorization.

28930439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86184.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 28930439 is about 5378.7023527985. The cubic root of 28930439 is about 306.9858382769.

The spelling of 28930439 in words is "twenty-eight million, nine hundred thirty thousand, four hundred thirty-nine".