1220365 has 8 divisors (see below), whose sum is σ = 1500408. Its totient is φ = 952320.

The previous prime is 1220363. The next prime is 1220369. The reversal of 1220365 is 5630221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 111556 + 1108809 = 334^2 + 1053^2 .

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

It is not a de Polignac number, because 1220365 - 2¹ = 1220363 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220363) 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, 2772 + ... + 3181.

It is an arithmetic number, because the mean of its divisors is an integer number (187551).

2^1220365 is an apocalyptic number.

It is an amenable number.

1220365 is a deficient number, since it is larger than the sum of its proper divisors (280043).

1220365 is an equidigital number, since it uses as much as digits as its factorization.

1220365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5999.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 1220365 is about 1104.7013170989. The cubic root of 1220365 is about 106.8636280549.

Adding to 1220365 its reverse (5630221), we get a palindrome (6850586).

The spelling of 1220365 in words is "one million, two hundred twenty thousand, three hundred sixty-five".