723665947 has 4 divisors (see below), whose sum is σ = 723730680. Its totient is φ = 723601216.

The previous prime is 723665941. The next prime is 723665959. The reversal of 723665947 is 749566327.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 749566327 = 21089 ⋅35543.

It is a cyclic number.

It is not a de Polignac number, because 723665947 - 2¹⁹ = 723141659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 723665947.

It is not an unprimeable number, because it can be changed into a prime (723665941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10813 + ... + 39550.

It is an arithmetic number, because the mean of its divisors is an integer number (180932670).

Almost surely, 2^723665947 is an apocalyptic number.

723665947 is a deficient number, since it is larger than the sum of its proper divisors (64733).

723665947 is a wasteful number, since it uses less digits than its factorization.

723665947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64732.

The product of its digits is 1905120, while the sum is 49.

The square root of 723665947 is about 26901.0398869635. The cubic root of 723665947 is about 897.7995408227.

The spelling of 723665947 in words is "seven hundred twenty-three million, six hundred sixty-five thousand, nine hundred forty-seven".