1840640 has 40 divisors (see below), whose sum is σ = 4419360. Its totient is φ = 735232.

The previous prime is 1840633. The next prime is 1840649. The reversal of 1840640 is 460481.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1840649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2201 + ... + 2919.

It is an arithmetic number, because the mean of its divisors is an integer number (110484).

2^1840640 is an apocalyptic number.

1840640 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 1840640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2209680).

1840640 is an abundant number, since it is smaller than the sum of its proper divisors (2578720).

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

1840640 is an frugal number, since it uses more digits than its factorization.

1840640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742 (or 726 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 1840640 is about 1356.7018832448. The cubic root of 1840640 is about 122.5527192215.

The spelling of 1840640 in words is "one million, eight hundred forty thousand, six hundred forty".