28397129 has 2 divisors, whose sum is σ = 28397130. Its totient is φ = 28397128.

The previous prime is 28397107. The next prime is 28397143. The reversal of 28397129 is 92179382.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27541504 + 855625 = 5248^2 + 925^2 .

It is a cyclic number.

It is not a de Polignac number, because 28397129 - 2¹⁶ = 28331593 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28390129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14198564 + 14198565.

It is an arithmetic number, because the mean of its divisors is an integer number (14198565).

Almost surely, 2^28397129 is an apocalyptic number.

It is an amenable number.

28397129 is a deficient number, since it is larger than the sum of its proper divisors (1).

28397129 is an equidigital number, since it uses as much as digits as its factorization.

28397129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 41.

The square root of 28397129 is about 5328.8956642066. The cubic root of 28397129 is about 305.0877790884.

The spelling of 28397129 in words is "twenty-eight million, three hundred ninety-seven thousand, one hundred twenty-nine".