721343023 has 4 divisors (see below), whose sum is σ = 721800288. Its totient is φ = 720885760.

The previous prime is 721343011. The next prime is 721343039. The reversal of 721343023 is 320343127.

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 721343023 - 2²⁹ = 184472111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721343323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226258 + ... + 229423.

It is an arithmetic number, because the mean of its divisors is an integer number (180450072).

Almost surely, 2^721343023 is an apocalyptic number.

721343023 is a deficient number, since it is larger than the sum of its proper divisors (457265).

721343023 is a wasteful number, since it uses less digits than its factorization.

721343023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457264.

The product of its (nonzero) digits is 3024, while the sum is 25.

The square root of 721343023 is about 26857.8298267004. The cubic root of 721343023 is about 896.8378836927.

It can be divided in two parts, 72134 and 3023, that added together give a palindrome (75157).

The spelling of 721343023 in words is "seven hundred twenty-one million, three hundred forty-three thousand, twenty-three".