890 has 8 divisors (see below), whose sum is σ = 1620. Its totient is φ = 352.
The previous prime is 887. The next prime is 907. The reversal of 890 is 98.
It can be written as a sum of positive squares in 2 ways, for example, as 841 + 49 = 29^2 + 7^2 .
It is a sphenic number, since it is the product of 3 distinct primes.
It is an alternating number because its digits alternate between even and odd.
It is a plaindrome in base 9, base 14 and base 16.
It is a nialpdrome in base 12.
It is a zygodrome in base 9.
It is a congruent number.
It is an unprimeable number.
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 in 3 ways as a sum of consecutive naturals, for example, 35 + ... + 54.
890 is a deficient number, since it is larger than the sum of its proper divisors (730).
890 is a wasteful number, since it uses less digits than its factorization.
890 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 96.
The product of its (nonzero) digits is 72, while the sum is 17.
The square root of 890 is about 29.8328677804. The cubic root of 890 is about 9.6190017161.
Subtracting from 890 its product of nonzero digits (72), we obtain a palindrome (818).
The spelling of 890 in words is "eight hundred ninety", and thus it is an aban number and an oban number.
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