1620812 has 12 divisors (see below), whose sum is σ = 2905896. Its totient is φ = 790560.

The previous prime is 1620811. The next prime is 1620823. The reversal of 1620812 is 2180261.

It is not an unprimeable number, because it can be changed into a prime (1620811) 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 3 ways as a sum of consecutive naturals, for example, 4778 + ... + 5105.

It is an arithmetic number, because the mean of its divisors is an integer number (242158).

2^1620812 is an apocalyptic number.

It is an amenable number.

1620812 is a deficient number, since it is larger than the sum of its proper divisors (1285084).

1620812 is a wasteful number, since it uses less digits than its factorization.

1620812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9928 (or 9926 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 1620812 is about 1273.1111499001. Note that the first 4 decimals coincide. The cubic root of 1620812 is about 117.4656486274.

The spelling of 1620812 in words is "one million, six hundred twenty thousand, eight hundred twelve".