28459939 has 2 divisors, whose sum is σ = 28459940. Its totient is φ = 28459938.

The previous prime is 28459913. The next prime is 28459979. The reversal of 28459939 is 93995482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28459939 - 2¹⁹ = 27935651 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28459892 and 28459901.

It is not a weakly prime, because it can be changed into another prime (28459909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14229969 + 14229970.

It is an arithmetic number, because the mean of its divisors is an integer number (14229970).

Almost surely, 2^28459939 is an apocalyptic number.

28459939 is a deficient number, since it is larger than the sum of its proper divisors (1).

28459939 is an equidigital number, since it uses as much as digits as its factorization.

28459939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 699840, while the sum is 49.

The square root of 28459939 is about 5334.7857501497. The cubic root of 28459939 is about 305.3125489063.

The spelling of 28459939 in words is "twenty-eight million, four hundred fifty-nine thousand, nine hundred thirty-nine".