730856821 has 8 divisors (see below), whose sum is σ = 735890400. Its totient is φ = 725834160.

The previous prime is 730856807. The next prime is 730856827. The reversal of 730856821 is 128658037.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 730856821 - 2⁹ = 730856309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (730856827) 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, 166270 + ... + 170608.

It is an arithmetic number, because the mean of its divisors is an integer number (91986300).

Almost surely, 2^730856821 is an apocalyptic number.

It is an amenable number.

730856821 is a deficient number, since it is larger than the sum of its proper divisors (5033579).

730856821 is a wasteful number, since it uses less digits than its factorization.

730856821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5459.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 730856821 is about 27034.3637062166. The cubic root of 730856821 is about 900.7634760234.

The spelling of 730856821 in words is "seven hundred thirty million, eight hundred fifty-six thousand, eight hundred twenty-one".