921388752 has 60 divisors (see below), whose sum is σ = 2633492160. Its totient is φ = 300592704.

The previous prime is 921388751. The next prime is 921388759. The reversal of 921388752 is 257883129.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 921388698 and 921388707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921388751) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61302 + ... + 74837.

It is an arithmetic number, because the mean of its divisors is an integer number (43891536).

Almost surely, 2^921388752 is an apocalyptic number.

It is an amenable number.

921388752 is an abundant number, since it is smaller than the sum of its proper divisors (1712103408).

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

921388752 is a wasteful number, since it uses less digits than its factorization.

921388752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136200 (or 136191 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 921388752 is about 30354.3860422180. The cubic root of 921388752 is about 973.0779586904.

The spelling of 921388752 in words is "nine hundred twenty-one million, three hundred eighty-eight thousand, seven hundred fifty-two".