1840040 has 32 divisors (see below), whose sum is σ = 4180680. Its totient is φ = 728832.

The previous prime is 1840031. The next prime is 1840043. The reversal of 1840040 is 400481.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1684804 + 155236 = 1298^2 + 394^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1840043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6134 + ... + 6426.

2^1840040 is an apocalyptic number.

1840040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1840040 is an abundant number, since it is smaller than the sum of its proper divisors (2340640).

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

1840040 is a wasteful number, since it uses less digits than its factorization.

1840040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1840040 is about 1356.4807407405. The cubic root of 1840040 is about 122.5394014584.

The spelling of 1840040 in words is "one million, eight hundred forty thousand, forty".