1220045 has 4 divisors (see below), whose sum is σ = 1464060. Its totient is φ = 976032.

The previous prime is 1220041. The next prime is 1220071. The reversal of 1220045 is 5400221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 175561 + 1044484 = 419^2 + 1022^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220045 - 2² = 1220041 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122000 + ... + 122009.

It is an arithmetic number, because the mean of its divisors is an integer number (366015).

2^1220045 is an apocalyptic number.

It is an amenable number.

1220045 is a deficient number, since it is larger than the sum of its proper divisors (244015).

1220045 is an equidigital number, since it uses as much as digits as its factorization.

1220045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244014.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 1220045 is about 1104.5564720737. The cubic root of 1220045 is about 106.8542867648.

Adding to 1220045 its reverse (5400221), we get a palindrome (6620266).

The spelling of 1220045 in words is "one million, two hundred twenty thousand, forty-five".