1220004 has 18 divisors (see below), whose sum is σ = 3083990.
Its totient is φ = 406656.
The previous prime is 1219991. The next prime is 1220027. The reversal of 1220004 is 4000221.
It can be written as a sum of positive squares in only one way, i.e., 1205604 + 14400 = 1098^2 + 120^2
It is a tau number, because it is divible by the number of its divisors (18).
It is a Harshad number since it is a multiple of its sum of digits (9).
It is an unprimeable number.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16909 + ... + 16980.
21220004 is an apocalyptic number.
It is an amenable number.
1220004 is an abundant number, since it is smaller than the sum of its proper divisors (1863986).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1220004 is a wasteful number, since it uses less digits than its factorization.
1220004 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 33899 (or 33894 counting only the distinct ones).
The product of its (nonzero) digits is 16, while the sum is 9.
The square root of 1220004 is about 1104.5379124322.
The cubic root of 1220004 is about 106.8530897940.
Adding to 1220004 its reverse (4000221), we get a palindrome (5220225).
The spelling of 1220004 in words is "one million, two hundred twenty thousand, four".