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9991912 = 2371131579
BaseRepresentation
bin100110000111…
…011011101000
3200210122022211
4212013123220
510024220122
6554054504
7150633640
oct46073350
920718284
109991912
115705087
12341a434
1320bac98
141481520
15d25877
hex9876e8

9991912 has 32 divisors (see below), whose sum is σ = 21614400. Its totient is φ = 4241664.

The previous prime is 9991879. The next prime is 9991939. The reversal of 9991912 is 2191999.

9991912 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5539 + ... + 7117.

It is an arithmetic number, because the mean of its divisors is an integer number (675450).

Almost surely, 29991912 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 9991912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10807200).

9991912 is an abundant number, since it is smaller than the sum of its proper divisors (11622488).

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

9991912 is a wasteful number, since it uses less digits than its factorization.

9991912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1705 (or 1701 counting only the distinct ones).

The product of its digits is 13122, while the sum is 40.

The square root of 9991912 is about 3160.9985763996. The cubic root of 9991912 is about 215.3853697776.

The spelling of 9991912 in words is "nine million, nine hundred ninety-one thousand, nine hundred twelve".