921497072 has 80 divisors (see below), whose sum is σ = 1892450304. Its totient is φ = 434112000.

The previous prime is 921496967. The next prime is 921497089. The reversal of 921497072 is 270794129.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 4824497 + ... + 4824687.

Almost surely, 2^921497072 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 921497072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (946225152).

921497072 is an abundant number, since it is smaller than the sum of its proper divisors (970953232).

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

921497072 is a wasteful number, since it uses less digits than its factorization.

921497072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438 (or 432 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 921497072 is about 30356.1702459319. The cubic root of 921497072 is about 973.1160894194.

The spelling of 921497072 in words is "nine hundred twenty-one million, four hundred ninety-seven thousand, seventy-two".