1220355 has 24 divisors (see below), whose sum is σ = 2164032. Its totient is φ = 635904.

The previous prime is 1220353. The next prime is 1220363. The reversal of 1220355 is 5530221.

It is a happy number.

It is not a de Polignac number, because 1220355 - 2¹ = 1220353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220353) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1827 + ... + 2403.

It is an arithmetic number, because the mean of its divisors is an integer number (90168).

2^1220355 is an apocalyptic number.

1220355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1220355 is a deficient number, since it is larger than the sum of its proper divisors (943677).

1220355 is a wasteful number, since it uses less digits than its factorization.

1220355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635 (or 632 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 1220355 is about 1104.6967909793. The cubic root of 1220355 is about 106.8633361643.

Adding to 1220355 its reverse (5530221), we get a palindrome (6750576).

The spelling of 1220355 in words is "one million, two hundred twenty thousand, three hundred fifty-five".