1220385 has 8 divisors (see below), whose sum is σ = 1952640. Its totient is φ = 650864.

The previous prime is 1220369. The next prime is 1220393. The reversal of 1220385 is 5830221.

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 1220385 - 2⁴ = 1220369 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40665 + ... + 40694.

It is an arithmetic number, because the mean of its divisors is an integer number (244080).

2^1220385 is an apocalyptic number.

1220385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1220385 is a deficient number, since it is larger than the sum of its proper divisors (732255).

1220385 is an equidigital number, since it uses as much as digits as its factorization.

1220385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81367.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1220385 is about 1104.7103692824. The cubic root of 1220385 is about 106.8642118313.

The spelling of 1220385 in words is "one million, two hundred twenty thousand, three hundred eighty-five".