28398947 has 2 divisors, whose sum is σ = 28398948. Its totient is φ = 28398946.

The previous prime is 28398919. The next prime is 28398961. The reversal of 28398947 is 74989382.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28398947 - 2¹⁰ = 28397923 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28398895 and 28398904.

It is not a weakly prime, because it can be changed into another prime (28398247) 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, 14199473 + 14199474.

It is an arithmetic number, because the mean of its divisors is an integer number (14199474).

Almost surely, 2^28398947 is an apocalyptic number.

28398947 is a deficient number, since it is larger than the sum of its proper divisors (1).

28398947 is an equidigital number, since it uses as much as digits as its factorization.

28398947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 50.

The square root of 28398947 is about 5329.0662409094. The cubic root of 28398947 is about 305.0942895793.

The spelling of 28398947 in words is "twenty-eight million, three hundred ninety-eight thousand, nine hundred forty-seven".