• 290 can be written using four 4's:

290 has 8 divisors (see below), whose sum is σ = 540. Its totient is φ = 112.

The previous prime is 283. The next prime is 293. The reversal of 290 is 92.

290 = T_{10} + T_{11} + ... +
T_{13}.

290 is nontrivially palindromic in base 12.

290 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 17^{2}+1.

It can be written as a sum of positive squares in 2 ways, for example, as 289 + 1 = 17^2 + 1^2 .

It is a sliding number, since 290 = 40 + 250 and 1/40 + 1/250 = 0.0290.

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.

290 is an undulating number in base 12.

It is a plaindrome in base 11, base 14, base 15 and base 16.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (293) by changing a digit.

290 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5 + ... + 24.

290 is a deficient number, since it is larger than the sum of its proper divisors (250).

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

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

The sum of its prime factors is 36.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 290 is about 17.0293863659. The cubic root of 290 is about 6.6191059480.

Subtracting from 290 its product of nonzero digits (18), we obtain a palindrome (272).

The spelling of 290 in words is "two hundred ninety", and thus it is an aban number.

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