1821965730 has 32 divisors (see below), whose sum is σ = 4709081664. Its totient is φ = 448483776.

The previous prime is 1821965707. The next prime is 1821965731. The reversal of 1821965730 is 375691281.

It is not an unprimeable number, because it can be changed into a prime (1821965731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2335464 + ... + 2336243.

It is an arithmetic number, because the mean of its divisors is an integer number (147158802).

Almost surely, 2^1821965730 is an apocalyptic number.

1821965730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1821965730 is an abundant number, since it is smaller than the sum of its proper divisors (2887115934).

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

1821965730 is a wasteful number, since it uses less digits than its factorization.

1821965730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4671730.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 1821965730 is about 42684.4905088488. The cubic root of 1821965730 is about 1221.3685551520.

The spelling of 1821965730 in words is "one billion, eight hundred twenty-one million, nine hundred sixty-five thousand, seven hundred thirty".