1823665920 has 144 divisors (see below), whose sum is σ = 5879116320. Its totient is φ = 481738752.

The previous prime is 1823665919. The next prime is 1823665931. The reversal of 1823665920 is 295663281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 416382 + ... + 420738.

Almost surely, 2^1823665920 is an apocalyptic number.

1823665920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1823665920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2939558160).

1823665920 is an abundant number, since it is smaller than the sum of its proper divisors (4055450400).

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

1823665920 is a wasteful number, since it uses less digits than its factorization.

1823665920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4490 (or 4476 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 1823665920 is about 42704.4016466687. The cubic root of 1823665920 is about 1221.7483487969.

The spelling of 1823665920 in words is "one billion, eight hundred twenty-three million, six hundred sixty-five thousand, nine hundred twenty".