840248321 has 8 divisors (see below), whose sum is σ = 924211488. Its totient is φ = 763860900.

The previous prime is 840248317. The next prime is 840248327. The reversal of 840248321 is 123842048.

It is not a de Polignac number, because 840248321 - 2² = 840248317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840248327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 314315 + ... + 316976.

It is an arithmetic number, because the mean of its divisors is an integer number (115526436).

Almost surely, 2^840248321 is an apocalyptic number.

It is an amenable number.

840248321 is a deficient number, since it is larger than the sum of its proper divisors (83963167).

840248321 is an equidigital number, since it uses as much as digits as its factorization.

840248321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631324 (or 631302 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 840248321 is about 28987.0371200645. The cubic root of 840248321 is about 943.6317632908.

The spelling of 840248321 in words is "eight hundred forty million, two hundred forty-eight thousand, three hundred twenty-one".