128042507 has 2 divisors, whose sum is σ = 128042508. Its totient is φ = 128042506.

The previous prime is 128042503. The next prime is 128042573. The reversal of 128042507 is 705240821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128042507 - 2² = 128042503 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128042507.

It is not a weakly prime, because it can be changed into another prime (128042503) 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, 64021253 + 64021254.

It is an arithmetic number, because the mean of its divisors is an integer number (64021254).

Almost surely, 2^128042507 is an apocalyptic number.

128042507 is a deficient number, since it is larger than the sum of its proper divisors (1).

128042507 is an equidigital number, since it uses as much as digits as its factorization.

128042507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 128042507 is about 11315.5869047964. The cubic root of 128042507 is about 504.0242007255.

The spelling of 128042507 in words is "one hundred twenty-eight million, forty-two thousand, five hundred seven".