1223100 has 90 divisors (see below), whose sum is σ = 3991064. Its totient is φ = 324000.

The previous prime is 1223093. The next prime is 1223119. The reversal of 1223100 is 13221.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (90).

It is a super-2 number, since 2×1223100² = 2991947220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 8025 + ... + 8175.

2^1223100 is an apocalyptic number.

1223100 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 1223100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1995532).

1223100 is an abundant number, since it is smaller than the sum of its proper divisors (2767964).

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

1223100 is a wasteful number, since it uses less digits than its factorization.

1223100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 1223100 is about 1105.9385154700. The cubic root of 1223100 is about 106.9434003509.

Adding to 1223100 its reverse (13221), we get a palindrome (1236321).

The spelling of 1223100 in words is "one million, two hundred twenty-three thousand, one hundred".