128406697 has 2 divisors, whose sum is σ = 128406698. Its totient is φ = 128406696.

The previous prime is 128406683. The next prime is 128406703. The reversal of 128406697 is 796604821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65108761 + 63297936 = 8069^2 + 7956^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128406697 is a prime.

It is not a weakly prime, because it can be changed into another prime (128406637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64203348 + 64203349.

It is an arithmetic number, because the mean of its divisors is an integer number (64203349).

Almost surely, 2^128406697 is an apocalyptic number.

It is an amenable number.

128406697 is a deficient number, since it is larger than the sum of its proper divisors (1).

128406697 is an equidigital number, since it uses as much as digits as its factorization.

128406697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 128406697 is about 11331.6678825317. The cubic root of 128406697 is about 504.5016120146.

The spelling of 128406697 in words is "one hundred twenty-eight million, four hundred six thousand, six hundred ninety-seven".