723647 has 4 divisors (see below), whose sum is σ = 740520. Its totient is φ = 706776.

The previous prime is 723623. The next prime is 723661. The reversal of 723647 is 746327.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 723647 - 2⁸ = 723391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 723647.

It is not an unprimeable number, because it can be changed into a prime (723607) 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, 8372 + ... + 8457.

It is an arithmetic number, because the mean of its divisors is an integer number (185130).

2⁷²³⁶⁴⁷ is an apocalyptic number.

723647 is a deficient number, since it is larger than the sum of its proper divisors (16873).

723647 is a wasteful number, since it uses less digits than its factorization.

723647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16872.

The product of its digits is 7056, while the sum is 29.

The square root of 723647 is about 850.6744383135. The cubic root of 723647 is about 89.7791705367.

The spelling of 723647 in words is "seven hundred twenty-three thousand, six hundred forty-seven".