1906 has 4 divisors (see below), whose sum is σ = 2862.
Its totient is φ = 952.
The previous prime is 1901. The next prime is 1907. The reversal of 1906 is 6091.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in only one way, i.e., 1681 + 225 = 41^2 + 15^2
It is a plaindrome in base 12.
It is a nialpdrome in base 15 and base 16.
It is a self number, because there is not a number n which added to its sum of digits gives 1906.
It is not an unprimeable number, because it can be changed into a prime (1901) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 475 + ... + 478.
1906 is a deficient number, since it is larger than the sum of its proper divisors (956).
1906 is an equidigital number, since it uses as much as digits as its factorization.
1906 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 955.
The product of its (nonzero) digits is 54, while the sum is 16.
The square root of 1906 is about 43.6577599059.
The cubic root of 1906 is about 12.3986470949.
Adding to 1906 its reverse (6091), we get a palindrome (7997).
It can be divided in two parts, 190 and 6, that added together give a square (196 = 142).
The spelling of 1906 in words is "one thousand, nine hundred six".