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1998161 = 11373487
BaseRepresentation
bin111100111110101010001
310202111221222
413213311101
51002420121
6110454425
722661354
oct7476521
93674858
101998161
111145280
12804415
1354c659
143a029b
152970ab
hex1e7d51

1998161 has 8 divisors (see below), whose sum is σ = 2190144. Its totient is φ = 1807920.

The previous prime is 1998133. The next prime is 1998169. The reversal of 1998161 is 1618991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1998161 - 210 = 1997137 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1998169) 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, 3860 + ... + 4346.

It is an arithmetic number, because the mean of its divisors is an integer number (273768).

21998161 is an apocalyptic number.

1998161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1998161 is a deficient number, since it is larger than the sum of its proper divisors (191983).

1998161 is a wasteful number, since it uses less digits than its factorization.

1998161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871.

The product of its digits is 3888, while the sum is 35.

The square root of 1998161 is about 1413.5632281578. The cubic root of 1998161 is about 125.9534765673.

The spelling of 1998161 in words is "one million, nine hundred ninety-eight thousand, one hundred sixty-one".

Divisors: 1 11 373 487 4103 5357 181651 1998161