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9921875 = 57127
BaseRepresentation
bin100101110110…
…010101010011
3200200002020212
4211312111103
510020000000
6552354335
7150222515
oct45662523
920602225
109921875
1156674a7
1233a59ab
132095142
141463bb5
15d0ec35
hex976553

9921875 has 16 divisors (see below), whose sum is σ = 12499968. Its totient is φ = 7875000.

The previous prime is 9921869. The next prime is 9921889. The reversal of 9921875 is 5781299.

It is not a de Polignac number, because 9921875 - 28 = 9921619 is a prime.

It is a Duffinian number.

Its product of digits (45360) is a multiple of the sum of its prime factors (162).

It is a nialpdrome in base 16.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 78062 + ... + 78188.

It is an arithmetic number, because the mean of its divisors is an integer number (781248).

Almost surely, 29921875 is an apocalyptic number.

9921875 is a deficient number, since it is larger than the sum of its proper divisors (2578093).

9921875 is an frugal number, since it uses more digits than its factorization.

9921875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 132 counting only the distinct ones).

The product of its digits is 45360, while the sum is 41.

The square root of 9921875 is about 3149.9007920885. The cubic root of 9921875 is about 214.8809508585.

The spelling of 9921875 in words is "nine million, nine hundred twenty-one thousand, eight hundred seventy-five".

Divisors: 1 5 25 125 127 625 635 3125 3175 15625 15875 78125 79375 396875 1984375 9921875