1921885 has 16 divisors (see below), whose sum is σ = 2699136. Its totient is φ = 1286208.

The previous prime is 1921883. The next prime is 1921889. The reversal of 1921885 is 5881291.

It is not a de Polignac number, because 1921885 - 2¹ = 1921883 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1921885.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921883) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 867 + ... + 2143.

It is an arithmetic number, because the mean of its divisors is an integer number (168696).

2^1921885 is an apocalyptic number.

It is an amenable number.

1921885 is a deficient number, since it is larger than the sum of its proper divisors (777251).

1921885 is a wasteful number, since it uses less digits than its factorization.

1921885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332.

The product of its digits is 5760, while the sum is 34.

The square root of 1921885 is about 1386.3206699750. The cubic root of 1921885 is about 124.3299614710.

It can be divided in two parts, 19 and 21885, that added together give a square (21904 = 148²).

The spelling of 1921885 in words is "one million, nine hundred twenty-one thousand, eight hundred eighty-five".