921823980 has 384 divisors, whose sum is σ = 3470874624. Its totient is φ = 178421760.

The previous prime is 921823937. The next prime is 921823993. The reversal of 921823980 is 89328129.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 9503292 + ... + 9503388.

It is an arithmetic number, because the mean of its divisors is an integer number (9038736).

Almost surely, 2^921823980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 921823980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1735437312).

921823980 is an abundant number, since it is smaller than the sum of its proper divisors (2549050644).

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

921823980 is a wasteful number, since it uses less digits than its factorization.

921823980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 921823980 is about 30361.5543080390. The cubic root of 921823980 is about 973.2311492256.

The spelling of 921823980 in words is "nine hundred twenty-one million, eight hundred twenty-three thousand, nine hundred eighty".