128421354 has 8 divisors (see below), whose sum is σ = 256842720. Its totient is φ = 42807116.

The previous prime is 128421353. The next prime is 128421427. The reversal of 128421354 is 453124821.

It is a sphenic number, since it is the product of 3 distinct primes.

128421354 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (128421353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10701774 + ... + 10701785.

It is an arithmetic number, because the mean of its divisors is an integer number (32105340).

Almost surely, 2^128421354 is an apocalyptic number.

128421354 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128421354 is a wasteful number, since it uses less digits than its factorization.

128421354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21403564.

The product of its digits is 7680, while the sum is 30.

The square root of 128421354 is about 11332.3145914681. The cubic root of 128421354 is about 504.5208067528.

It can be divided in two parts, 12842 and 1354, that added together give a triangular number (14196 = T₁₆₈).

The spelling of 128421354 in words is "one hundred twenty-eight million, four hundred twenty-one thousand, three hundred fifty-four".