1821945923 has 8 divisors (see below), whose sum is σ = 2082516480. Its totient is φ = 1561448520.

The previous prime is 1821945911. The next prime is 1821945949. The reversal of 1821945923 is 3295491281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1821945923 - 2²⁰ = 1820897347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1821945973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54308 + ... + 81198.

It is an arithmetic number, because the mean of its divisors is an integer number (260314560).

Almost surely, 2^1821945923 is an apocalyptic number.

1821945923 is a deficient number, since it is larger than the sum of its proper divisors (260570557).

1821945923 is an equidigital number, since it uses as much as digits as its factorization.

1821945923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36577.

The product of its digits is 155520, while the sum is 44.

The square root of 1821945923 is about 42684.2584918609. The cubic root of 1821945923 is about 1221.3641292117.

The spelling of 1821945923 in words is "one billion, eight hundred twenty-one million, nine hundred forty-five thousand, nine hundred twenty-three".