921382380 has 72 divisors (see below), whose sum is σ = 2822051232. Its totient is φ = 243311616.

The previous prime is 921382327. The next prime is 921382411. The reversal of 921382380 is 83283129.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 23 ways as a sum of consecutive naturals, for example, 6309 + ... + 43388.

It is an arithmetic number, because the mean of its divisors is an integer number (39195156).

Almost surely, 2^921382380 is an apocalyptic number.

921382380 is a gapful number since it is divisible by the number (90) 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 921382380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1411025616).

921382380 is an abundant number, since it is smaller than the sum of its proper divisors (1900668852).

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

921382380 is a wasteful number, since it uses less digits than its factorization.

921382380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49815 (or 49810 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 921382380 is about 30354.2810819166. The cubic root of 921382380 is about 973.0757155305.

The spelling of 921382380 in words is "nine hundred twenty-one million, three hundred eighty-two thousand, three hundred eighty".