1840440 has 96 divisors (see below), whose sum is σ = 6443280. Its totient is φ = 419328.

The previous prime is 1840429. The next prime is 1840441. The reversal of 1840440 is 440481.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1840441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5724 + ... + 6036.

2^1840440 is an apocalyptic number.

1840440 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 1840440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3221640).

1840440 is an abundant number, since it is smaller than the sum of its proper divisors (4602840).

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

1840440 is a wasteful number, since it uses less digits than its factorization.

1840440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341 (or 330 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 1840440 is about 1356.6281730821. The cubic root of 1840440 is about 122.5482802888.

The spelling of 1840440 in words is "one million, eight hundred forty thousand, four hundred forty".