1838840 has 16 divisors (see below), whose sum is σ = 4137480. Its totient is φ = 735520.

The previous prime is 1838819. The next prime is 1838843. The reversal of 1838840 is 488381.

1838840 = T₂₈₃ + T₂₈₄ + ... + T₃₂₂.

It is a junction number, because it is equal to n+sod(n) for n = 1838797 and 1838806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1838843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22946 + ... + 23025.

2^1838840 is an apocalyptic number.

1838840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1838840 is an abundant number, since it is smaller than the sum of its proper divisors (2298640).

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

1838840 is a wasteful number, since it uses less digits than its factorization.

1838840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45982 (or 45978 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 1838840 is about 1356.0383475404. The cubic root of 1838840 is about 122.5127572442.

The spelling of 1838840 in words is "one million, eight hundred thirty-eight thousand, eight hundred forty".