921263920 has 80 divisors (see below), whose sum is σ = 2212894080. Its totient is φ = 356483072.

The previous prime is 921263899. The next prime is 921263927. The reversal of 921263920 is 29362129.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (921263927) 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, 333264 + ... + 336016.

It is an arithmetic number, because the mean of its divisors is an integer number (27661176).

Almost surely, 2^921263920 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 921263920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1106447040).

921263920 is an abundant number, since it is smaller than the sum of its proper divisors (1291630160).

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

921263920 is a wasteful number, since it uses less digits than its factorization.

921263920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2902 (or 2896 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 921263920 is about 30352.3297293634. The cubic root of 921263920 is about 973.0340117124.

The spelling of 921263920 in words is "nine hundred twenty-one million, two hundred sixty-three thousand, nine hundred twenty".