1220357 has 8 divisors (see below), whose sum is σ = 1288896. Its totient is φ = 1153152.

The previous prime is 1220353. The next prime is 1220363. The reversal of 1220357 is 7530221.

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

It is a cyclic number.

It is not a de Polignac number, because 1220357 - 2² = 1220353 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 (1220353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1958 + ... + 2504.

It is an arithmetic number, because the mean of its divisors is an integer number (161112).

2^1220357 is an apocalyptic number.

It is an amenable number.

1220357 is a deficient number, since it is larger than the sum of its proper divisors (68539).

1220357 is an equidigital number, since it uses as much as digits as its factorization.

1220357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 1220357 is about 1104.6976962047. The cubic root of 1220357 is about 106.8633945425.

Adding to 1220357 its reverse (7530221), we get a palindrome (8750578).

The spelling of 1220357 in words is "one million, two hundred twenty thousand, three hundred fifty-seven".