1201820 has 12 divisors (see below), whose sum is σ = 2523864. Its totient is φ = 480720.

The previous prime is 1201813. The next prime is 1201829. The reversal of 1201820 is 281021.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 1201795 and 1201804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30026 + ... + 30065.

It is an arithmetic number, because the mean of its divisors is an integer number (210322).

2^1201820 is an apocalyptic number.

1201820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201820 is an abundant number, since it is smaller than the sum of its proper divisors (1322044).

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

1201820 is a wasteful number, since it uses less digits than its factorization.

1201820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60100 (or 60098 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1201820 is about 1096.2755128160. The cubic root of 1201820 is about 106.3195530753.

Adding to 1201820 its reverse (281021), we get a palindrome (1482841).

The spelling of 1201820 in words is "one million, two hundred one thousand, eight hundred twenty".