42734398729 has 9 divisors (see below), whose sum is σ = 46975020519. Its totient is φ = 38847386160.

The previous prime is 42734398711. The next prime is 42734398757. The reversal of 42734398729 is 92789343724.

The square root of 42734398729 is 206723.

It is a perfect power (a square), and thus also a powerful number.

42734398729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 31189326025 + 11545072704 = 176605^2 + 107448^2 .

It is not a de Polignac number, because 42734398729 - 2⁵ = 42734398697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42734398709) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2264557 + ... + 2283349.

Almost surely, 2^42734398729 is an apocalyptic number.

42734398729 is the 206723-rd square number.

42734398729 is the 103362-nd centered octagonal number.

It is an amenable number.

42734398729 is a deficient number, since it is larger than the sum of its proper divisors (4240621790).

42734398729 is an frugal number, since it uses more digits than its factorization.

42734398729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37608 (or 18804 counting only the distinct ones).

The product of its digits is 18289152, while the sum is 58.

The spelling of 42734398729 in words is "forty-two billion, seven hundred thirty-four million, three hundred ninety-eight thousand, seven hundred twenty-nine".