128662397 has 2 divisors, whose sum is σ = 128662398. Its totient is φ = 128662396.

The previous prime is 128662381. The next prime is 128662423. The reversal of 128662397 is 793266821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115369081 + 13293316 = 10741^2 + 3646^2 .

It is a cyclic number.

It is not a de Polignac number, because 128662397 - 2⁴ = 128662381 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128662327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64331198 + 64331199.

It is an arithmetic number, because the mean of its divisors is an integer number (64331199).

Almost surely, 2^128662397 is an apocalyptic number.

It is an amenable number.

128662397 is a deficient number, since it is larger than the sum of its proper divisors (1).

128662397 is an equidigital number, since it uses as much as digits as its factorization.

128662397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 44.

The square root of 128662397 is about 11342.9448116439. The cubic root of 128662397 is about 504.8362662342.

The spelling of 128662397 in words is "one hundred twenty-eight million, six hundred sixty-two thousand, three hundred ninety-seven".