1819648 has 22 divisors (see below), whose sum is σ = 3639566. Its totient is φ = 909312.

The previous prime is 1819637. The next prime is 1819651. The reversal of 1819648 is 8469181.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1557504 + 262144 = 1248^2 + 512^2 .

It is a super-2 number, since 2×1819648² = 6622237687808, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 136 + ... + 1912.

2^1819648 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 1819648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1819783).

1819648 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1819648 is an equidigital number, since it uses as much as digits as its factorization.

1819648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1797 (or 1779 counting only the distinct ones).

The product of its digits is 13824, while the sum is 37.

The square root of 1819648 is about 1348.9432901349. The cubic root of 1819648 is about 122.0850432756.

The spelling of 1819648 in words is "one million, eight hundred nineteen thousand, six hundred forty-eight".