1921008 has 40 divisors (see below), whose sum is σ = 5126656. Its totient is φ = 619200.

The previous prime is 1920991. The next prime is 1921013. The reversal of 1921008 is 8001291.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 843 + ... + 2133.

2^1921008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1921008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2563328).

1921008 is an abundant number, since it is smaller than the sum of its proper divisors (3205648).

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

1921008 is a wasteful number, since it uses less digits than its factorization.

1921008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333 (or 1327 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1921008 is about 1386.0043289976. The cubic root of 1921008 is about 124.3110470604.

Adding to 1921008 its reverse (8001291), we get a palindrome (9922299).

The spelling of 1921008 in words is "one million, nine hundred twenty-one thousand, eight".