921396648 has 32 divisors (see below), whose sum is σ = 2352504960. Its totient is φ = 300597120.

The previous prime is 921396631. The next prime is 921396661. The reversal of 921396648 is 846693129.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 921396597 and 921396606.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 407293 + ... + 409548.

It is an arithmetic number, because the mean of its divisors is an integer number (73515780).

Almost surely, 2^921396648 is an apocalyptic number.

It is an amenable number.

921396648 is an abundant number, since it is smaller than the sum of its proper divisors (1431108312).

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

921396648 is a wasteful number, since it uses less digits than its factorization.

921396648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816897 (or 816893 counting only the distinct ones).

The product of its digits is 559872, while the sum is 48.

The square root of 921396648 is about 30354.5161055155. The cubic root of 921396648 is about 973.0807383357.

The spelling of 921396648 in words is "nine hundred twenty-one million, three hundred ninety-six thousand, six hundred forty-eight".