1220003 has 8 divisors (see below), whose sum is σ = 1256640.
Its totient is φ = 1184040.
The previous prime is 1219991. The next prime is 1220027. The reversal of 1220003 is 3000221.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 1220003 - 28 = 1219747 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (1220203) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8708 + ... + 8846.
It is an arithmetic number, because the mean of its divisors is an integer number (157080).
21220003 is an apocalyptic number.
1220003 is a deficient number, since it is larger than the sum of its proper divisors (36637).
1220003 is a wasteful number, since it uses less digits than its factorization.
1220003 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 337.
The product of its (nonzero) digits is 12, while the sum is 8.
The square root of 1220003 is about 1104.5374597541.
The cubic root of 1220003 is about 106.8530605992.
Adding to 1220003 its reverse (3000221), we get a palindrome (4220224).
The spelling of 1220003 in words is "one million, two hundred twenty thousand, three".