128455942 has 4 divisors (see below), whose sum is σ = 192683916. Its totient is φ = 64227970.

The previous prime is 128455933. The next prime is 128455963. The reversal of 128455942 is 249554821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 249554821 = 631 ⋅395491.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 128455895 and 128455904.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32113984 + ... + 32113987.

It is an arithmetic number, because the mean of its divisors is an integer number (48170979).

Almost surely, 2^128455942 is an apocalyptic number.

128455942 is a deficient number, since it is larger than the sum of its proper divisors (64227974).

128455942 is an equidigital number, since it uses as much as digits as its factorization.

128455942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64227973.

The product of its digits is 115200, while the sum is 40.

The square root of 128455942 is about 11333.8405670805. The cubic root of 128455942 is about 504.5660972457.

The spelling of 128455942 in words is "one hundred twenty-eight million, four hundred fifty-five thousand, nine hundred forty-two".