28396939 has 2 divisors, whose sum is σ = 28396940. Its totient is φ = 28396938.

The previous prime is 28396933. The next prime is 28396943. The reversal of 28396939 is 93969382.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28396939 - 2¹⁹ = 27872651 is a prime.

It is a super-2 number, since 2×28396939² = 1612772289139442, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28396892 and 28396901.

It is not a weakly prime, because it can be changed into another prime (28396933) 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, 14198469 + 14198470.

It is an arithmetic number, because the mean of its divisors is an integer number (14198470).

Almost surely, 2^28396939 is an apocalyptic number.

28396939 is a deficient number, since it is larger than the sum of its proper divisors (1).

28396939 is an equidigital number, since it uses as much as digits as its factorization.

28396939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 49.

The square root of 28396939 is about 5328.8778368433. The cubic root of 28396939 is about 305.0870986580.

The spelling of 28396939 in words is "twenty-eight million, three hundred ninety-six thousand, nine hundred thirty-nine".