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199912 = 2324989
BaseRepresentation
bin110000110011101000
3101011020011
4300303220
522344122
64141304
71461556
oct606350
9334204
10199912
11127219
1297834
136ccbb
1452bd6
153e377
hex30ce8

199912 has 8 divisors (see below), whose sum is σ = 374850. Its totient is φ = 99952.

The previous prime is 199909. The next prime is 199921. The reversal of 199912 is 219991.

It can be written as a sum of positive squares in only one way, i.e., 106276 + 93636 = 326^2 + 306^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×1999123 = 23968333937155584, which contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12487 + ... + 12502.

2199912 is an apocalyptic number.

It is an amenable number.

199912 is a deficient number, since it is larger than the sum of its proper divisors (174938).

199912 is a wasteful number, since it uses less digits than its factorization.

199912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24995 (or 24991 counting only the distinct ones).

The product of its digits is 1458, while the sum is 31.

The square root of 199912 is about 447.1151976840. The cubic root of 199912 is about 58.4717763873.

It can be divided in two parts, 199 and 912, that added together give a palindrome (1111).

The spelling of 199912 in words is "one hundred ninety-nine thousand, nine hundred twelve".

Divisors: 1 2 4 8 24989 49978 99956 199912