1220658 has 16 divisors (see below), whose sum is σ = 2461536. Its totient is φ = 403520.

The previous prime is 1220657. The next prime is 1220663. The reversal of 1220658 is 8560221.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (1220657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10 + ... + 1562.

It is an arithmetic number, because the mean of its divisors is an integer number (153846).

2^1220658 is an apocalyptic number.

1220658 is an abundant number, since it is smaller than the sum of its proper divisors (1240878).

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

1220658 is a wasteful number, since it uses less digits than its factorization.

1220658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1689.

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

The square root of 1220658 is about 1104.8339241714. The cubic root of 1220658 is about 106.8721797416.

Adding to 1220658 its reverse (8560221), we get a palindrome (9780879).

The spelling of 1220658 in words is "one million, two hundred twenty thousand, six hundred fifty-eight".