1821645360 has 60 divisors (see below), whose sum is σ = 6117694752. Its totient is φ = 485771904.

The previous prime is 1821645341. The next prime is 1821645389. The reversal of 1821645360 is 635461281.

It is a happy number.

1821645360 is a `hidden beast` number, since 1 + 8 + 2 + 1 + 645 + 3 + 6 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1264312 + ... + 1265751.

Almost surely, 2^1821645360 is an apocalyptic number.

1821645360 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1821645360 is an abundant number, since it is smaller than the sum of its proper divisors (4296049392).

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

1821645360 is a wasteful number, since it uses less digits than its factorization.

1821645360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2530082 (or 2530073 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1821645360 is about 42680.7375756324. The cubic root of 1821645360 is about 1221.2969634687.

The spelling of 1821645360 in words is "one billion, eight hundred twenty-one million, six hundred forty-five thousand, three hundred sixty".