1821650 has 12 divisors (see below), whose sum is σ = 3388362. Its totient is φ = 728640.

The previous prime is 1821649. The next prime is 1821679. The reversal of 1821650 is 561281.

It can be written as a sum of positive squares in 3 ways, for example, as 1646089 + 175561 = 1283^2 + 419^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18167 + ... + 18266.

2^1821650 is an apocalyptic number.

1821650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1821650 is a deficient number, since it is larger than the sum of its proper divisors (1566712).

1821650 is a wasteful number, since it uses less digits than its factorization.

1821650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36445 (or 36440 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 1821650 is about 1349.6851484698. The cubic root of 1821650 is about 122.1298000409.

The spelling of 1821650 in words is "one million, eight hundred twenty-one thousand, six hundred fifty".