1909944 has 48 divisors (see below), whose sum is σ = 5307120. Its totient is φ = 620160.

The previous prime is 1909927. The next prime is 1909949. The reversal of 1909944 is 4499091.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1909899 and 1909908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1909949) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2629 + ... + 3275.

It is an arithmetic number, because the mean of its divisors is an integer number (110565).

2^1909944 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 1909944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2653560).

1909944 is an abundant number, since it is smaller than the sum of its proper divisors (3397176).

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

1909944 is a wasteful number, since it uses less digits than its factorization.

1909944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700 (or 693 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 1909944 is about 1382.0072358711. The cubic root of 1909944 is about 124.0719319031.

The spelling of 1909944 in words is "one million, nine hundred nine thousand, nine hundred forty-four".