1212220 has 12 divisors (see below), whose sum is σ = 2545704. Its totient is φ = 484880.

The previous prime is 1212199. The next prime is 1212221. The reversal of 1212220 is 222121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1212197 and 1212206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30286 + ... + 30325.

It is an arithmetic number, because the mean of its divisors is an integer number (212142).

2^1212220 is an apocalyptic number.

1212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212220 is an abundant number, since it is smaller than the sum of its proper divisors (1333484).

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

1212220 is a wasteful number, since it uses less digits than its factorization.

1212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60620 (or 60618 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1212220 is about 1101.0086284857. The cubic root of 1212220 is about 106.6253529242.

Adding to 1212220 its reverse (222121), we get a palindrome (1434341).

Subtracting from 1212220 its reverse (222121), we obtain a palindrome (990099).

The spelling of 1212220 in words is "one million, two hundred twelve thousand, two hundred twenty".