1921938 has 16 divisors (see below), whose sum is σ = 3968256. Its totient is φ = 619920.

The previous prime is 1921937. The next prime is 1921967. The reversal of 1921938 is 8391291.

It is a junction number, because it is equal to n+sod(n) for n = 1921899 and 1921908.

It is not an unprimeable number, because it can be changed into a prime (1921937) 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, 4981 + ... + 5352.

It is an arithmetic number, because the mean of its divisors is an integer number (248016).

2^1921938 is an apocalyptic number.

1921938 is an abundant number, since it is smaller than the sum of its proper divisors (2046318).

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

1921938 is a wasteful number, since it uses less digits than its factorization.

1921938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10369.

The product of its digits is 3888, while the sum is 33.

The square root of 1921938 is about 1386.3397851898. The cubic root of 1921938 is about 124.3311043468.

The spelling of 1921938 in words is "one million, nine hundred twenty-one thousand, nine hundred thirty-eight".