128406319 has 2 divisors, whose sum is σ = 128406320. Its totient is φ = 128406318.

The previous prime is 128406293. The next prime is 128406353. The reversal of 128406319 is 913604821.

It is an a-pointer prime, because the next prime (128406353) can be obtained adding 128406319 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128406319 - 2¹¹ = 128404271 is a prime.

It is a super-2 number, since 2×128406319² = 32976365518259522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128406359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64203159 + 64203160.

It is an arithmetic number, because the mean of its divisors is an integer number (64203160).

Almost surely, 2^128406319 is an apocalyptic number.

128406319 is a deficient number, since it is larger than the sum of its proper divisors (1).

128406319 is an equidigital number, since it uses as much as digits as its factorization.

128406319 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 128406319 is about 11331.6512035978. The cubic root of 128406319 is about 504.5011169682.

The spelling of 128406319 in words is "one hundred twenty-eight million, four hundred six thousand, three hundred nineteen".