723971 has 4 divisors (see below), whose sum is σ = 755472. Its totient is φ = 692472.

The previous prime is 723967. The next prime is 723973. The reversal of 723971 is 179327.

It is a happy number.

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 723971 - 2² = 723967 is a prime.

It is a d-powerful number, because it can be written as 7 + 2¹⁷ + 9⁵ + 3¹² + 7⁴ + 1 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (723973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15716 + ... + 15761.

It is an arithmetic number, because the mean of its divisors is an integer number (188868).

2⁷²³⁹⁷¹ is an apocalyptic number.

723971 is a deficient number, since it is larger than the sum of its proper divisors (31501).

723971 is a wasteful number, since it uses less digits than its factorization.

723971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31500.

The product of its digits is 2646, while the sum is 29.

The square root of 723971 is about 850.8648541337. The cubic root of 723971 is about 89.7925675434.

Subtracting from 723971 its reverse (179327), we obtain a square (544644 = 738²).

The spelling of 723971 in words is "seven hundred twenty-three thousand, nine hundred seventy-one".