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19983842 = 22921092
BaseRepresentation
bin100110000111…
…0110111100010
31101121021200022
41030032313202
520103440332
61552153442
7331600634
oct114166742
941537608
1019983842
111030a17a
126838882
1341a8c78
142922a54
151b4b212
hex130ede2

19983842 has 18 divisors (see below), whose sum is σ = 31332483. Its totient is φ = 9558864.

The previous prime is 19983833. The next prime is 19983853. The reversal of 19983842 is 24838991.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 14371681 + 5612161 = 3791^2 + 2369^2 .

It is an ABA number since it can be written as A⋅BA, here for A=2, B=3161.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19983793 and 19983802.

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 8 ways as a sum of consecutive naturals, for example, 183284 + ... + 183392.

Almost surely, 219983842 is an apocalyptic number.

19983842 is a deficient number, since it is larger than the sum of its proper divisors (11348641).

19983842 is an equidigital number, since it uses as much as digits as its factorization.

19983842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278 (or 140 counting only the distinct ones).

The product of its digits is 124416, while the sum is 44.

The square root of 19983842 is about 4470.3290706614. The cubic root of 19983842 is about 271.3686426986.

The spelling of 19983842 in words is "nineteen million, nine hundred eighty-three thousand, eight hundred forty-two".

Divisors: 1 2 29 58 109 218 841 1682 3161 6322 11881 23762 91669 183338 344549 689098 9991921 19983842