1821411684 has 45 divisors (see below), whose sum is σ = 4763539011. Its totient is φ = 606881160.

The previous prime is 1821411661. The next prime is 1821411689. The reversal of 1821411684 is 4861141281.

The square root of 1821411684 is 42678.

It is a perfect power (a square), and thus also a powerful number.

1821411684 is a `hidden beast` number, since 182 + 1 + 411 + 68 + 4 = 666.

It is a super-2 number, since 2×1821411684² = 6635081045223431712, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (1821411689) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 767019 + ... + 769389.

Almost surely, 2^1821411684 is an apocalyptic number.

1821411684 is the 42678-th square number.

It is an amenable number.

1821411684 is an abundant number, since it is smaller than the sum of its proper divisors (2942127327).

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

1821411684 is an frugal number, since it uses more digits than its factorization.

1821411684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4758 (or 2376 counting only the distinct ones).

The product of its digits is 12288, while the sum is 36.

The cubic root of 1821411684 is about 1221.2447396203.

Multiplying 1821411684 by its sum of digits (36), we get a square (65570820624 = 256068²).

1821411684 divided by its sum of digits (36) gives a square (50594769 = 7113²).

The spelling of 1821411684 in words is "one billion, eight hundred twenty-one million, four hundred eleven thousand, six hundred eighty-four".