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9900009 = 33731069
BaseRepresentation
bin100101110000…
…111111101001
3200121222021000
4211300333221
510013300014
6552105213
7150102000
oct45607751
920558230
109900009
115652029
123395209
1320881c2
141459c37
15d08509
hex970fe9

9900009 has 32 divisors (see below), whose sum is σ = 17120000. Its totient is φ = 5651856.

The previous prime is 9899999. The next prime is 9900047. The reversal of 9900009 is 9000099.

It is not a de Polignac number, because 9900009 - 24 = 9899993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9900509) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8727 + ... + 9795.

It is an arithmetic number, because the mean of its divisors is an integer number (535000).

Almost surely, 29900009 is an apocalyptic number.

It is an amenable number.

9900009 is a deficient number, since it is larger than the sum of its proper divisors (7219991).

9900009 is a wasteful number, since it uses less digits than its factorization.

9900009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099 (or 1079 counting only the distinct ones).

The product of its (nonzero) digits is 729, while the sum is 27.

The square root of 9900009 is about 3146.4279747040. The cubic root of 9900009 is about 214.7229819694.

The spelling of 9900009 in words is "nine million, nine hundred thousand, nine".

Divisors: 1 3 7 9 21 27 49 63 147 189 343 441 1029 1069 1323 3087 3207 7483 9261 9621 22449 28863 52381 67347 157143 202041 366667 471429 1100001 1414287 3300003 9900009