128400830 has 32 divisors (see below), whose sum is σ = 247126464. Its totient is φ = 47863296.

The previous prime is 128400827. The next prime is 128400859. The reversal of 128400830 is 38004821.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 128400830.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13844 + ... + 21176.

It is an arithmetic number, because the mean of its divisors is an integer number (7722702).

Almost surely, 2^128400830 is an apocalyptic number.

128400830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128400830 is a deficient number, since it is larger than the sum of its proper divisors (118725634).

128400830 is a wasteful number, since it uses less digits than its factorization.

128400830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7460.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 128400830 is about 11331.4090032970. The cubic root of 128400830 is about 504.4939282096.

The spelling of 128400830 in words is "one hundred twenty-eight million, four hundred thousand, eight hundred thirty".