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BaseRepresentation
bin100110001001…
…011001101100
3200211001101122
4212021121230
510024444410
6554200112
7150666314
oct46113154
920731348
109999980
115710151
123423038
1320c1863
141484444
15d27e55
hex98966c

9999980 has 36 divisors (see below), whose sum is σ = 21849408. Its totient is φ = 3840480.

The previous prime is 9999973. The next prime is 9999991. The reversal of 9999980 is 899999.

It is a happy number.

It is a nialpdrome in base 10.

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 11 ways as a sum of consecutive naturals, for example, 78677 + ... + 78803.

It is an arithmetic number, because the mean of its divisors is an integer number (606928).

Almost surely, 29999980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9999980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10924704).

9999980 is an abundant number, since it is smaller than the sum of its proper divisors (11849428).

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

9999980 is a wasteful number, since it uses less digits than its factorization.

9999980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 53.

The square root of 9999980 is about 3162.2744978891. The cubic root of 9999980 is about 215.4433253741.

The spelling of 9999980 in words is "nine million, nine hundred ninety-nine thousand, nine hundred eighty".