1815944 has 32 divisors (see below), whose sum is σ = 3864000. Its totient is φ = 793152.

The previous prime is 1815943. The next prime is 1815959. The reversal of 1815944 is 4495181.

It is a super-2 number, since 2×1815944² = 6595305222272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1815944.

It is not an unprimeable number, because it can be changed into a prime (1815941) 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 7 ways as a sum of consecutive naturals, for example, 1517 + ... + 2435.

It is an arithmetic number, because the mean of its divisors is an integer number (120750).

2^1815944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1815944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1932000).

1815944 is an abundant number, since it is smaller than the sum of its proper divisors (2048056).

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

1815944 is a wasteful number, since it uses less digits than its factorization.

1815944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957 (or 953 counting only the distinct ones).

The product of its digits is 5760, while the sum is 32.

The square root of 1815944 is about 1347.5696642475. The cubic root of 1815944 is about 122.0021499218.

The spelling of 1815944 in words is "one million, eight hundred fifteen thousand, nine hundred forty-four".