1815648 has 24 divisors (see below), whose sum is σ = 4766328. Its totient is φ = 605184.

The previous prime is 1815647. The next prime is 1815673. The reversal of 1815648 is 8465181.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-3 number, since 3×1815648³ = 17956273905148133376, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1815647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9361 + ... + 9552.

It is an arithmetic number, because the mean of its divisors is an integer number (198597).

2^1815648 is an apocalyptic number.

It is an amenable number.

1815648 is an abundant number, since it is smaller than the sum of its proper divisors (2950680).

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

1815648 is a wasteful number, since it uses less digits than its factorization.

1815648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18926 (or 18918 counting only the distinct ones).

The product of its digits is 7680, while the sum is 33.

The square root of 1815648 is about 1347.4598324254. The cubic root of 1815648 is about 121.9955207529.

The spelling of 1815648 in words is "one million, eight hundred fifteen thousand, six hundred forty-eight".