8406243729 has 24 divisors (see below), whose sum is σ = 13260566592. Its totient is φ = 5100207840.

The previous prime is 8406243689. The next prime is 8406243773. The reversal of 8406243729 is 9273426048.

It is not a de Polignac number, because 8406243729 - 2⁹ = 8406243217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8406243799) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 497667 + ... + 514280.

It is an arithmetic number, because the mean of its divisors is an integer number (552523608).

Almost surely, 2^8406243729 is an apocalyptic number.

It is an amenable number.

8406243729 is a deficient number, since it is larger than the sum of its proper divisors (4854322863).

8406243729 is a wasteful number, since it uses less digits than its factorization.

8406243729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012037 (or 1012034 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The square root of 8406243729 is about 91685.5699060654. The cubic root of 8406243729 is about 2033.2962478918.

The spelling of 8406243729 in words is "eight billion, four hundred six million, two hundred forty-three thousand, seven hundred twenty-nine".