1821012 has 24 divisors (see below), whose sum is σ = 4272576. Its totient is φ = 603648.

The previous prime is 1820999. The next prime is 1821013. The reversal of 1821012 is 2101281.

It is a junction number, because it is equal to n+sod(n) for n = 1820982 and 1821000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821013) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2868 + ... + 3444.

It is an arithmetic number, because the mean of its divisors is an integer number (178024).

2^1821012 is an apocalyptic number.

1821012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1821012 is an abundant number, since it is smaller than the sum of its proper divisors (2451564).

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

1821012 is a wasteful number, since it uses less digits than its factorization.

1821012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847 (or 845 counting only the distinct ones).

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

The square root of 1821012 is about 1349.4487763528. The cubic root of 1821012 is about 122.1155404574.

Adding to 1821012 its reverse (2101281), we get a palindrome (3922293).

The spelling of 1821012 in words is "one million, eight hundred twenty-one thousand, twelve".