921409344 has 224 divisors, whose sum is σ = 2849270400. Its totient is φ = 295239168.

The previous prime is 921409343. The next prime is 921409361. The reversal of 921409344 is 443904129.

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

It is a junction number, because it is equal to n+sod(n) for n = 921409299 and 921409308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921409343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4058959 + ... + 4059185.

Almost surely, 2^921409344 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 921409344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1424635200).

921409344 is an abundant number, since it is smaller than the sum of its proper divisors (1927861056).

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

921409344 is an equidigital number, since it uses as much as digits as its factorization.

921409344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289 (or 261 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 921409344 is about 30354.7252334789. The cubic root of 921409344 is about 973.0852077016.

The spelling of 921409344 in words is "nine hundred twenty-one million, four hundred nine thousand, three hundred forty-four".