1921338 has 24 divisors (see below), whose sum is σ = 4193748. Its totient is φ = 635712.

The previous prime is 1921327. The next prime is 1921363. The reversal of 1921338 is 8331291.

It can be written as a sum of positive squares in 2 ways, for example, as 1912689 + 8649 = 1383^2 + 93^2 .

It is a Curzon number.

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 11 ways as a sum of consecutive naturals, for example, 2806 + ... + 3422.

2^1921338 is an apocalyptic number.

1921338 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1921338 is an abundant number, since it is smaller than the sum of its proper divisors (2272410).

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

1921338 is a wasteful number, since it uses less digits than its factorization.

1921338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798 (or 795 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 1921338 is about 1386.1233711326. The cubic root of 1921338 is about 124.3181649029.

The spelling of 1921338 in words is "one million, nine hundred twenty-one thousand, three hundred thirty-eight".