1213200 has 90 divisors (see below), whose sum is σ = 4222634. Its totient is φ = 322560.

The previous prime is 1213189. The next prime is 1213213. The reversal of 1213200 is 23121.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 20736 + 1192464 = 144^2 + 1092^2 .

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

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

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3432 + ... + 3768.

2^1213200 is an apocalyptic number.

1213200 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 1213200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2111317).

1213200 is an abundant number, since it is smaller than the sum of its proper divisors (3009434).

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

1213200 is a wasteful number, since it uses less digits than its factorization.

1213200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361 (or 347 counting only the distinct ones).

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

The square root of 1213200 is about 1101.4535850411. The cubic root of 1213200 is about 106.6540783756.

Adding to 1213200 its reverse (23121), we get a palindrome (1236321).

It can be divided in two parts, 121 and 3200, that added together give a triangular number (3321 = T₈₁).

The spelling of 1213200 in words is "one million, two hundred thirteen thousand, two hundred".