921806072 has 24 divisors (see below), whose sum is σ = 1899798600. Its totient is φ = 419002320.

The previous prime is 921806069. The next prime is 921806077. The reversal of 921806072 is 270608129.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921806077) 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 5 ways as a sum of consecutive naturals, for example, 475172 + ... + 477107.

It is an arithmetic number, because the mean of its divisors is an integer number (79158275).

Almost surely, 2^921806072 is an apocalyptic number.

It is an amenable number.

921806072 is an abundant number, since it is smaller than the sum of its proper divisors (977992528).

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

921806072 is a wasteful number, since it uses less digits than its factorization.

921806072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952307 (or 952292 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 921806072 is about 30361.2593941687. The cubic root of 921806072 is about 973.2248469609.

The spelling of 921806072 in words is "nine hundred twenty-one million, eight hundred six thousand, seventy-two".