1921626 has 48 divisors (see below), whose sum is σ = 4837248. Its totient is φ = 540000.

The previous prime is 1921573. The next prime is 1921631. The reversal of 1921626 is 6261291.

1921626 is a `hidden beast` number, since 19 + 21 + 626 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1921626.

It is a congruent 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 23 ways as a sum of consecutive naturals, for example, 12651 + ... + 12801.

It is an arithmetic number, because the mean of its divisors is an integer number (100776).

2^1921626 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1921626, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2418624).

1921626 is an abundant number, since it is smaller than the sum of its proper divisors (2915622).

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

1921626 is a wasteful number, since it uses less digits than its factorization.

1921626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267 (or 264 counting only the distinct ones).

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

The square root of 1921626 is about 1386.2272540965. The cubic root of 1921626 is about 124.3243761721.

The spelling of 1921626 in words is "one million, nine hundred twenty-one thousand, six hundred twenty-six".