1801212 has 48 divisors (see below), whose sum is σ = 4929792. Its totient is φ = 501120.

The previous prime is 1801207. The next prime is 1801213. The reversal of 1801212 is 2121081.

1801212 is a modest number, since divided by 1212 gives 180 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1801191 and 1801200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1801213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3183 + ... + 3705.

It is an arithmetic number, because the mean of its divisors is an integer number (102704).

2^1801212 is an apocalyptic number.

1801212 is a gapful number since it is divisible by the number (12) 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 1801212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2464896).

1801212 is an abundant number, since it is smaller than the sum of its proper divisors (3128580).

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

1801212 is a wasteful number, since it uses less digits than its factorization.

1801212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578 (or 576 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 1801212 is about 1342.0923962232. The cubic root of 1801212 is about 121.6713361149.

Adding to 1801212 its reverse (2121081), we get a palindrome (3922293).

The spelling of 1801212 in words is "one million, eight hundred one thousand, two hundred twelve".