723009861 has 32 divisors (see below), whose sum is σ = 1228780800. Its totient is φ = 411583680.

The previous prime is 723009803. The next prime is 723009871. The reversal of 723009861 is 168900327.

It is not a de Polignac number, because 723009861 - 2¹⁵ = 722977093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723009871) 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 31 ways as a sum of consecutive naturals, for example, 43731 + ... + 57951.

It is an arithmetic number, because the mean of its divisors is an integer number (38399400).

Almost surely, 2^723009861 is an apocalyptic number.

It is an amenable number.

723009861 is a deficient number, since it is larger than the sum of its proper divisors (505770939).

723009861 is a wasteful number, since it uses less digits than its factorization.

723009861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14506 (or 14500 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 723009861 is about 26888.8426861403. The cubic root of 723009861 is about 897.5281394436.

The spelling of 723009861 in words is "seven hundred twenty-three million, nine thousand, eight hundred sixty-one".