1816040 has 32 divisors (see below), whose sum is σ = 4142880. Its totient is φ = 716352.

The previous prime is 1816027. The next prime is 1816051. The reversal of 1816040 is 406181.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3047 + ... + 3593.

It is an arithmetic number, because the mean of its divisors is an integer number (129465).

2^1816040 is an apocalyptic number.

1816040 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 1816040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2071440).

1816040 is an abundant number, since it is smaller than the sum of its proper divisors (2326840).

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

1816040 is a wasteful number, since it uses less digits than its factorization.

1816040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641 (or 637 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 1816040 is about 1347.6052834565. The cubic root of 1816040 is about 122.0042997678.

Subtracting from 1816040 its product of nonzero digits (192), we obtain a cube (1815848 = 122³).

The spelling of 1816040 in words is "one million, eight hundred sixteen thousand, forty".