1821822730 has 64 divisors (see below), whose sum is σ = 4073287680. Its totient is φ = 571256064.

The previous prime is 1821822721. The next prime is 1821822757. The reversal of 1821822730 is 372281281.

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, 90007 + ... + 108373.

It is an arithmetic number, because the mean of its divisors is an integer number (63645120).

Almost surely, 2^1821822730 is an apocalyptic number.

1821822730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1821822730 is an abundant number, since it is smaller than the sum of its proper divisors (2251464950).

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

1821822730 is a wasteful number, since it uses less digits than its factorization.

1821822730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18503.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 1821822730 is about 42682.8153944887. The cubic root of 1821822730 is about 1221.3366006042.

The spelling of 1821822730 in words is "one billion, eight hundred twenty-one million, eight hundred twenty-two thousand, seven hundred thirty".