128903389 has 2 divisors, whose sum is σ = 128903390. Its totient is φ = 128903388.

The previous prime is 128903329. The next prime is 128903393. The reversal of 128903389 is 983309821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107122500 + 21780889 = 10350^2 + 4667^2 .

It is a cyclic number.

It is not a de Polignac number, because 128903389 - 2⁹ = 128902877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128903329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64451694 + 64451695.

It is an arithmetic number, because the mean of its divisors is an integer number (64451695).

Almost surely, 2^128903389 is an apocalyptic number.

It is an amenable number.

128903389 is a deficient number, since it is larger than the sum of its proper divisors (1).

128903389 is an equidigital number, since it uses as much as digits as its factorization.

128903389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 128903389 is about 11353.5628328732. The cubic root of 128903389 is about 505.1512653420.

The spelling of 128903389 in words is "one hundred twenty-eight million, nine hundred three thousand, three hundred eighty-nine".