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128406 = 2321401
BaseRepresentation
bin11111010110010110
320112010210
4133112112
513102111
62430250
71043235
oct372626
9215123
10128406
1188523
1262386
13465a5
1434b1c
15280a6
hex1f596

128406 has 8 divisors (see below), whose sum is σ = 256824. Its totient is φ = 42800.

The previous prime is 128399. The next prime is 128411. The reversal of 128406 is 604821.

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

128406 is an admirable number.

It is a Curzon number.

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 in 3 ways as a sum of consecutive naturals, for example, 10695 + ... + 10706.

It is an arithmetic number, because the mean of its divisors is an integer number (32103).

2128406 is an apocalyptic number.

128406 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.

128406 is a wasteful number, since it uses less digits than its factorization.

128406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21406.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 128406 is about 358.3378294292. The cubic root of 128406 is about 50.4500699190.

The spelling of 128406 in words is "one hundred twenty-eight thousand, four hundred six".

Divisors: 1 2 3 6 21401 42802 64203 128406