729443731 has 2 divisors, whose sum is σ = 729443732. Its totient is φ = 729443730.

The previous prime is 729443723. The next prime is 729443753. The reversal of 729443731 is 137344927.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 729443731 - 2³ = 729443723 is a prime.

It is a super-2 number, since 2×729443731² = 1064176313390400722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (729443711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364721865 + 364721866.

It is an arithmetic number, because the mean of its divisors is an integer number (364721866).

Almost surely, 2^729443731 is an apocalyptic number.

729443731 is a deficient number, since it is larger than the sum of its proper divisors (1).

729443731 is an equidigital number, since it uses as much as digits as its factorization.

729443731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 40.

The square root of 729443731 is about 27008.2159906944. The cubic root of 729443731 is about 900.1825683126.

The spelling of 729443731 in words is "seven hundred twenty-nine million, four hundred forty-three thousand, seven hundred thirty-one".