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19999899 = 33740737
BaseRepresentation
bin100110001001…
…0110010011011
31101122002201000
41030102302123
520104444044
61552400043
7331665513
oct114226233
941562630
1019999899
1110320247
126846023
1341b337a
142928843
151b50d69
hex1312c9b

19999899 has 8 divisors (see below), whose sum is σ = 29629520. Its totient is φ = 13333248.

The previous prime is 19999897. The next prime is 19999909. The reversal of 19999899 is 99899991.

It is not a de Polignac number, because 19999899 - 21 = 19999897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19999891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 370342 + ... + 370395.

It is an arithmetic number, because the mean of its divisors is an integer number (3703690).

Almost surely, 219999899 is an apocalyptic number.

19999899 is a deficient number, since it is larger than the sum of its proper divisors (9629621).

19999899 is an equidigital number, since it uses as much as digits as its factorization.

19999899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740746 (or 740740 counting only the distinct ones).

The product of its digits is 4251528, while the sum is 63.

The square root of 19999899 is about 4472.1246628420. The cubic root of 19999899 is about 271.4413047318.

The spelling of 19999899 in words is "nineteen million, nine hundred ninety-nine thousand, eight hundred ninety-nine".

Divisors: 1 3 9 27 740737 2222211 6666633 19999899