743320721 has 16 divisors (see below), whose sum is σ = 903389760. Its totient is φ = 602253120.

The previous prime is 743320681. The next prime is 743320723. The reversal of 743320721 is 127023347.

It is a cyclic number.

It is not a de Polignac number, because 743320721 - 2⁶ = 743320657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (743320723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85475 + ... + 93768.

It is an arithmetic number, because the mean of its divisors is an integer number (56461860).

Almost surely, 2^743320721 is an apocalyptic number.

It is an amenable number.

743320721 is a deficient number, since it is larger than the sum of its proper divisors (160069039).

743320721 is a wasteful number, since it uses less digits than its factorization.

743320721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179296.

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

The square root of 743320721 is about 27263.9087623180. The cubic root of 743320721 is about 905.8551265445.

The spelling of 743320721 in words is "seven hundred forty-three million, three hundred twenty thousand, seven hundred twenty-one".