1909140 has 48 divisors (see below), whose sum is σ = 5467392. Its totient is φ = 497536.

The previous prime is 1909129. The next prime is 1909147. The reversal of 1909140 is 419091.

It is a self number, because there is not a number n which added to its sum of digits gives 1909140.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1909147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2482 + ... + 3158.

It is an arithmetic number, because the mean of its divisors is an integer number (113904).

2^1909140 is an apocalyptic number.

1909140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1909140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2733696).

1909140 is an abundant number, since it is smaller than the sum of its proper divisors (3558252).

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

1909140 is a wasteful number, since it uses less digits than its factorization.

1909140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736 (or 734 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 1909140 is about 1381.7163239971. The cubic root of 1909140 is about 124.0545199033.

The spelling of 1909140 in words is "one million, nine hundred nine thousand, one hundred forty".