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1090 = 25109
BaseRepresentation
bin10001000010
31111101
4101002
513330
65014
73115
oct2102
91441
101090
11901
1276a
1365b
1457c
154ca
hex442

1090 has 8 divisors (see below), whose sum is σ = 1980. Its totient is φ = 432.

The previous prime is 1087. The next prime is 1091. The reversal of 1090 is 901.

Adding to 1090 its reverse (901), we get a palindrome (1991).

It can be divided in two parts, 10 and 90, that multiplied together give a square (900 = 302).

It is a happy number.

1090 is nontrivially palindromic in base 9.

It is a Cunningham number, because it is equal to 332+1.

It can be written as a sum of positive squares in 2 ways, for example, as 1089 + 1 = 33^2 + 1^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (10), and also a Moran number because the ratio is a prime number: 109 = 1090 / (1 + 0 + 9 + 0).

It is an alternating number because its digits alternate between odd and even.

1090 is a modest number, since divided by 90 gives 10 as remainder.

It is a plaindrome in base 14.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (1091) by changing a digit.

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, 45 + ... + 64.

21090 is an apocalyptic number.

1090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1090 is a deficient number, since it is larger than the sum of its proper divisors (890).

1090 is a wasteful number, since it uses less digits than its factorization.

1090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116.

The product of its (nonzero) digits is 9, while the sum is 10.

The square root of 1090 is about 33.0151480384. The cubic root of 1090 is about 10.2914246657.

The spelling of 1090 in words is "one thousand, ninety".

Divisors: 1 2 5 10 109 218 545 1090