721457829 has 24 divisors (see below), whose sum is σ = 1057073472. Its totient is φ = 474091200.

The previous prime is 721457819. The next prime is 721457831. The reversal of 721457829 is 928754127.

It is a happy number.

721457829 is a `hidden beast` number, since 72 + 1 + 4 + 578 + 2 + 9 = 666.

It is not a de Polignac number, because 721457829 - 2⁷ = 721457701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721457819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 448144 + ... + 449750.

It is an arithmetic number, because the mean of its divisors is an integer number (44044728).

Almost surely, 2^721457829 is an apocalyptic number.

It is an amenable number.

721457829 is a deficient number, since it is larger than the sum of its proper divisors (335615643).

721457829 is a wasteful number, since it uses less digits than its factorization.

721457829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2297 (or 2294 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 721457829 is about 26859.9670327422. The cubic root of 721457829 is about 896.8854601831.

The spelling of 721457829 in words is "seven hundred twenty-one million, four hundred fifty-seven thousand, eight hundred twenty-nine".