721317234 has 32 divisors (see below), whose sum is σ = 1595352384. Its totient is φ = 215585280.

The previous prime is 721317229. The next prime is 721317239. The reversal of 721317234 is 432713127.

It is an interprime number because it is at equal distance from previous prime (721317229) and next prime (721317239).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (721317239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70039 + ... + 79674.

It is an arithmetic number, because the mean of its divisors is an integer number (49854762).

Almost surely, 2^721317234 is an apocalyptic number.

721317234 is an abundant number, since it is smaller than the sum of its proper divisors (874035150).

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

721317234 is a wasteful number, since it uses less digits than its factorization.

721317234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149802.

The product of its digits is 7056, while the sum is 30.

The square root of 721317234 is about 26857.3497203280. The cubic root of 721317234 is about 896.8271958382.

The spelling of 721317234 in words is "seven hundred twenty-one million, three hundred seventeen thousand, two hundred thirty-four".