128906837 has 2 divisors, whose sum is σ = 128906838. Its totient is φ = 128906836.

The previous prime is 128906797. The next prime is 128906857. The reversal of 128906837 is 738609821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110019121 + 18887716 = 10489^2 + 4346^2 .

It is a cyclic number.

It is not a de Polignac number, because 128906837 - 2⁸ = 128906581 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 (128906857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64453418 + 64453419.

It is an arithmetic number, because the mean of its divisors is an integer number (64453419).

Almost surely, 2^128906837 is an apocalyptic number.

It is an amenable number.

128906837 is a deficient number, since it is larger than the sum of its proper divisors (1).

128906837 is an equidigital number, since it uses as much as digits as its factorization.

128906837 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 128906837 is about 11353.7146784654. The cubic root of 128906837 is about 505.1557693509.

The spelling of 128906837 in words is "one hundred twenty-eight million, nine hundred six thousand, eight hundred thirty-seven".