1220685 has 16 divisors (see below), whose sum is σ = 2068416. Its totient is φ = 612608.

The previous prime is 1220669. The next prime is 1220689. The reversal of 1220685 is 5860221.

It is a cyclic number.

It is not a de Polignac number, because 1220685 - 2⁴ = 1220669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2139 + ... + 2648.

It is an arithmetic number, because the mean of its divisors is an integer number (129276).

2^1220685 is an apocalyptic number.

1220685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1220685 is a deficient number, since it is larger than the sum of its proper divisors (847731).

1220685 is a wasteful number, since it uses less digits than its factorization.

1220685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4812.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1220685 is about 1104.8461431349. The cubic root of 1220685 is about 106.8729677121.

The spelling of 1220685 in words is "one million, two hundred twenty thousand, six hundred eighty-five".