720394453 has 4 divisors (see below), whose sum is σ = 722532460. Its totient is φ = 718256448.

The previous prime is 720394439. The next prime is 720394469. The reversal of 720394453 is 354493027.

720394453 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 540888049 + 179506404 = 23257^2 + 13398^2 .

It is a cyclic number.

It is not a de Polignac number, because 720394453 - 2⁹ = 720393941 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 (750394453) 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, 1068498 + ... + 1069171.

It is an arithmetic number, because the mean of its divisors is an integer number (180633115).

Almost surely, 2^720394453 is an apocalyptic number.

It is an amenable number.

720394453 is a deficient number, since it is larger than the sum of its proper divisors (2138007).

720394453 is a wasteful number, since it uses less digits than its factorization.

720394453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2138006.

The product of its (nonzero) digits is 90720, while the sum is 37.

The square root of 720394453 is about 26840.1649212519. The cubic root of 720394453 is about 896.4445956847. Note that the first 3 decimals are identical.

The spelling of 720394453 in words is "seven hundred twenty million, three hundred ninety-four thousand, four hundred fifty-three".