1220090 has 16 divisors (see below), whose sum is σ = 2325672. Its totient is φ = 459264.

The previous prime is 1220077. The next prime is 1220099. The reversal of 1220090 is 900221.

It can be written as a sum of positive squares in 4 ways, for example, as 1216609 + 3481 = 1103^2 + 59^2 .

It is not an unprimeable number, because it can be changed into a prime (1220099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3419 + ... + 3758.

2^1220090 is an apocalyptic number.

1220090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1220090 is a deficient number, since it is larger than the sum of its proper divisors (1105582).

1220090 is a wasteful number, since it uses less digits than its factorization.

1220090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7201.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1220090 is about 1104.5768420531. The cubic root of 1220090 is about 106.8556004824.

It can be divided in two parts, 12 and 20090, that added together give a palindrome (20102).

The spelling of 1220090 in words is "one million, two hundred twenty thousand, ninety".