128421958 has 16 divisors (see below), whose sum is σ = 223762464. Its totient is φ = 54135360.

The previous prime is 128421941. The next prime is 128421959. The reversal of 128421958 is 859124821.

It is a self number, because there is not a number n which added to its sum of digits gives 128421958.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128421959) 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 in 7 ways as a sum of consecutive naturals, for example, 74335 + ... + 76042.

It is an arithmetic number, because the mean of its divisors is an integer number (13985154).

Almost surely, 2^128421958 is an apocalyptic number.

128421958 is a deficient number, since it is larger than the sum of its proper divisors (95340506).

128421958 is a wasteful number, since it uses less digits than its factorization.

128421958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150447.

The product of its digits is 46080, while the sum is 40.

The square root of 128421958 is about 11332.3412408910. The cubic root of 128421958 is about 504.5215977170.

The spelling of 128421958 in words is "one hundred twenty-eight million, four hundred twenty-one thousand, nine hundred fifty-eight".