723830985 has 20 divisors (see below), whose sum is σ = 1297534788. Its totient is φ = 386042976.

The previous prime is 723830983. The next prime is 723831019. The reversal of 723830985 is 589038327.

It can be written as a sum of positive squares in 2 ways, for example, as 172896201 + 550934784 = 13149^2 + 23472^2 .

It is not a de Polignac number, because 723830985 - 2¹ = 723830983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 723830985.

It is not an unprimeable number, because it can be changed into a prime (723830983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 893214 + ... + 894023.

Almost surely, 2^723830985 is an apocalyptic number.

It is an amenable number.

723830985 is a deficient number, since it is larger than the sum of its proper divisors (573703803).

723830985 is a wasteful number, since it uses less digits than its factorization.

723830985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1787254 (or 1787245 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 723830985 is about 26904.1072143270. The cubic root of 723830985 is about 897.8677858367.

The spelling of 723830985 in words is "seven hundred twenty-three million, eight hundred thirty thousand, nine hundred eighty-five".