1921868 has 18 divisors (see below), whose sum is σ = 3643164. Its totient is φ = 886704.

The previous prime is 1921849. The next prime is 1921873. The reversal of 1921868 is 8681291.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 746 + ... + 2097.

It is an arithmetic number, because the mean of its divisors is an integer number (202398).

2^1921868 is an apocalyptic number.

It is an amenable number.

1921868 is a deficient number, since it is larger than the sum of its proper divisors (1721296).

1921868 is a wasteful number, since it uses less digits than its factorization.

1921868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2873 (or 2858 counting only the distinct ones).

The product of its digits is 6912, while the sum is 35.

The square root of 1921868 is about 1386.3145386239. The cubic root of 1921868 is about 124.3295948838.

The spelling of 1921868 in words is "one million, nine hundred twenty-one thousand, eight hundred sixty-eight".