1821536316 has 96 divisors (see below), whose sum is σ = 4901836800. Its totient is φ = 584340480.

The previous prime is 1821536309. The next prime is 1821536329. The reversal of 1821536316 is 6136351281.

1821536316 = 219² + 220² + ... + 1762².

1821536316 is a `hidden beast` number, since 1 + 8 + 2 + 15 + 3 + 631 + 6 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 644755 + ... + 647573.

It is an arithmetic number, because the mean of its divisors is an integer number (51060800).

Almost surely, 2^1821536316 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 1821536316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2450918400).

1821536316 is an abundant number, since it is smaller than the sum of its proper divisors (3080300484).

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

1821536316 is a wasteful number, since it uses less digits than its factorization.

1821536316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3056 (or 3048 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 1821536316 is about 42679.4601184223. The cubic root of 1821536316 is about 1221.2725939680.

Adding to 1821536316 its reverse (6136351281), we get a palindrome (7957887597).

The spelling of 1821536316 in words is "one billion, eight hundred twenty-one million, five hundred thirty-six thousand, three hundred sixteen".