1921612 has 48 divisors (see below), whose sum is σ = 4451328. Its totient is φ = 702720.

The previous prime is 1921573. The next prime is 1921631. The reversal of 1921612 is 2161291.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5053 + ... + 5419.

It is an arithmetic number, because the mean of its divisors is an integer number (92736).

2^1921612 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 1921612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2225664).

1921612 is an abundant number, since it is smaller than the sum of its proper divisors (2529716).

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

1921612 is a wasteful number, since it uses less digits than its factorization.

1921612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406 (or 404 counting only the distinct ones).

The product of its digits is 216, while the sum is 22.

The square root of 1921612 is about 1386.2222044102. Note that the first 4 decimals coincide. The cubic root of 1921612 is about 124.3240742497.

The spelling of 1921612 in words is "one million, nine hundred twenty-one thousand, six hundred twelve".