921390496 has 48 divisors (see below), whose sum is σ = 1958537448. Its totient is φ = 424166400.

The previous prime is 921390443. The next prime is 921390559. The reversal of 921390496 is 694093129.

It can be written as a sum of positive squares in 4 ways, for example, as 430147600 + 491242896 = 20740^2 + 22164^2 .

It is a super-2 number, since 2×921390496² = 1697920892238252032, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172506 + ... + 177766.

Almost surely, 2^921390496 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 921390496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (979268724).

921390496 is an abundant number, since it is smaller than the sum of its proper divisors (1037146952).

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

921390496 is a wasteful number, since it uses less digits than its factorization.

921390496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5705 (or 5697 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 43.

The square root of 921390496 is about 30354.4147695191. The cubic root of 921390496 is about 973.0785726357.

The spelling of 921390496 in words is "nine hundred twenty-one million, three hundred ninety thousand, four hundred ninety-six".