28406839 has 2 divisors, whose sum is σ = 28406840. Its totient is φ = 28406838.

The previous prime is 28406837. The next prime is 28406879. The reversal of 28406839 is 93860482.

It is an a-pointer prime, because the next prime (28406879) can be obtained adding 28406839 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28406839 - 2¹ = 28406837 is a prime.

Together with 28406837, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28406831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14203419 + 14203420.

It is an arithmetic number, because the mean of its divisors is an integer number (14203420).

Almost surely, 2^28406839 is an apocalyptic number.

28406839 is a deficient number, since it is larger than the sum of its proper divisors (1).

28406839 is an equidigital number, since it uses as much as digits as its factorization.

28406839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 28406839 is about 5329.8066569060. The cubic root of 28406839 is about 305.1225486215.

The spelling of 28406839 in words is "twenty-eight million, four hundred six thousand, eight hundred thirty-nine".