1220100 has 108 divisors (see below), whose sum is σ = 4155984. Its totient is φ = 275520.

The previous prime is 1220099. The next prime is 1220147. The reversal of 1220100 is 10221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 14659 + ... + 14741.

2^1220100 is an apocalyptic number.

1220100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2077992).

1220100 is an abundant number, since it is smaller than the sum of its proper divisors (2935884).

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

1220100 is a wasteful number, since it uses less digits than its factorization.

1220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 1220100 is about 1104.5813686642. The cubic root of 1220100 is about 106.8558924153.

Adding to 1220100 its reverse (10221), we get a palindrome (1230321).

The spelling of 1220100 in words is "one million, two hundred twenty thousand, one hundred".