1220346 has 40 divisors (see below), whose sum is σ = 2834304. Its totient is φ = 393660.

The previous prime is 1220333. The next prime is 1220347. The reversal of 1220346 is 6430221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1220347) 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 19 ways as a sum of consecutive naturals, for example, 39351 + ... + 39381.

2^1220346 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220346, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1417152).

1220346 is an abundant number, since it is smaller than the sum of its proper divisors (1613958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1220346 is an frugal number, since it uses more digits than its factorization.

1220346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60 (or 36 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1220346 is about 1104.6927174559. The cubic root of 1220346 is about 106.8630734614.

Adding to 1220346 its reverse (6430221), we get a palindrome (7650567).

The spelling of 1220346 in words is "one million, two hundred twenty thousand, three hundred forty-six".