128390914 has 4 divisors (see below), whose sum is σ = 192586374. Its totient is φ = 64195456.

The previous prime is 128390893. The next prime is 128390959. The reversal of 128390914 is 419093821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 419093821 = 823 ⋅509227.

It can be written as a sum of positive squares in only one way, i.e., 125776225 + 2614689 = 11215^2 + 1617^2 .

It is an unprimeable number.

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, 32097727 + ... + 32097730.

Almost surely, 2^128390914 is an apocalyptic number.

128390914 is a deficient number, since it is larger than the sum of its proper divisors (64195460).

128390914 is an equidigital number, since it uses as much as digits as its factorization.

128390914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64195459.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 128390914 is about 11330.9714499684. The cubic root of 128390914 is about 504.4809410387.

The spelling of 128390914 in words is "one hundred twenty-eight million, three hundred ninety thousand, nine hundred fourteen".