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8121984 = 273131627
BaseRepresentation
bin11110111110111010000000
3120021122021020
4132332322000
54034400414
6450025440
7126015153
oct36767200
916248236
108121984
114648192
122878280
1318b4b10
141115c9a
15aa67a9
hex7bee80

8121984 has 64 divisors (see below), whose sum is σ = 23247840. Its totient is φ = 2497536.

The previous prime is 8121983. The next prime is 8121991. The reversal of 8121984 is 4891218.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8121983) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4179 + ... + 5805.

Almost surely, 28121984 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 8121984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11623920).

8121984 is an abundant number, since it is smaller than the sum of its proper divisors (15125856).

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

8121984 is a wasteful number, since it uses less digits than its factorization.

8121984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1657 (or 1645 counting only the distinct ones).

The product of its digits is 4608, while the sum is 33.

The square root of 8121984 is about 2849.9094722464. The cubic root of 8121984 is about 201.0114099609.

The spelling of 8121984 in words is "eight million, one hundred twenty-one thousand, nine hundred eighty-four".