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16438 = 28219
BaseRepresentation
bin100000000110110
3211112211
410000312
51011223
6204034
765632
oct40066
924484
1016438
1111394
12961a
137636
145dc2
154d0d
hex4036

16438 has 4 divisors (see below), whose sum is σ = 24660. Its totient is φ = 8218.

The previous prime is 16433. The next prime is 16447. The reversal of 16438 is 83461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83461 = 711923.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a d-powerful number, because it can be written as 1 + 62 + 47 + 32 + 8 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4108 + ... + 4111.

It is an arithmetic number, because the mean of its divisors is an integer number (6165).

216438 is an apocalyptic number.

16438 is a deficient number, since it is larger than the sum of its proper divisors (8222).

16438 is an equidigital number, since it uses as much as digits as its factorization.

16438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8221.

The product of its digits is 576, while the sum is 22.

The square root of 16438 is about 128.2107639787. The cubic root of 16438 is about 25.4262897659.

Adding to 16438 its reverse (83461), we get a palindrome (99899).

It can be divided in two parts, 164 and 38, that added together give a palindrome (202).

The spelling of 16438 in words is "sixteen thousand, four hundred thirty-eight".

Divisors: 1 2 8219 16438