723123009 has 12 divisors (see below), whose sum is σ = 1193726976. Its totient is φ = 413213112.

The previous prime is 723123007. The next prime is 723123029. The reversal of 723123009 is 900321327.

It is not a de Polignac number, because 723123009 - 2¹ = 723123007 is a prime.

It is a super-2 number, since 2×723123009² = 1045813772290428162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (723123007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5739009 + ... + 5739134.

It is an arithmetic number, because the mean of its divisors is an integer number (99477248).

Almost surely, 2^723123009 is an apocalyptic number.

It is an amenable number.

723123009 is a deficient number, since it is larger than the sum of its proper divisors (470603967).

723123009 is a wasteful number, since it uses less digits than its factorization.

723123009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11478156 (or 11478153 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 723123009 is about 26890.9465991809. The cubic root of 723123009 is about 897.5749567934.

The spelling of 723123009 in words is "seven hundred twenty-three million, one hundred twenty-three thousand, nine".