723121 has 8 divisors (see below), whose sum is σ = 870080. Its totient is φ = 587088.

The previous prime is 723119. The next prime is 723127. The reversal of 723121 is 121327.

It is a happy number.

723121 is an esthetic number in base 11, because in such base its adjacent digits differ by 1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 723121 - 2¹ = 723119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 723095 and 723104.

It is not an unprimeable number, because it can be changed into a prime (723127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2586 + ... + 2851.

It is an arithmetic number, because the mean of its divisors is an integer number (108760).

2⁷²³¹²¹ is an apocalyptic number.

It is an amenable number.

723121 is a deficient number, since it is larger than the sum of its proper divisors (146959).

723121 is a wasteful number, since it uses less digits than its factorization.

723121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5463.

The product of its digits is 84, while the sum is 16.

The square root of 723121 is about 850.3652156574. The cubic root of 723121 is about 89.7574125570.

Adding to 723121 its reverse (121327), we get a palindrome (844448).

The spelling of 723121 in words is "seven hundred twenty-three thousand, one hundred twenty-one", and thus it is an iban number.