28406923 has 2 divisors, whose sum is σ = 28406924. Its totient is φ = 28406922.

The previous prime is 28406879. The next prime is 28406927. The reversal of 28406923 is 32960482.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28406923 - 2²¹ = 26309771 is a prime.

It is not a weakly prime, because it can be changed into another prime (28406927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14203461 + 14203462.

It is an arithmetic number, because the mean of its divisors is an integer number (14203462).

Almost surely, 2^28406923 is an apocalyptic number.

28406923 is a deficient number, since it is larger than the sum of its proper divisors (1).

28406923 is an equidigital number, since it uses as much as digits as its factorization.

28406923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 28406923 is about 5329.8145371110. The cubic root of 28406923 is about 305.1228493738.

The spelling of 28406923 in words is "twenty-eight million, four hundred six thousand, nine hundred twenty-three".