12729439642 has 8 divisors (see below), whose sum is σ = 19164618432. Its totient is φ = 6341233500.

The previous prime is 12729439609. The next prime is 12729439643. The reversal of 12729439642 is 24693492721.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (12729439643) 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, 11742484 + ... + 11743567.

It is an arithmetic number, because the mean of its divisors is an integer number (2395577304).

Almost surely, 2^12729439642 is an apocalyptic number.

12729439642 is a deficient number, since it is larger than the sum of its proper divisors (6435178790).

12729439642 is a wasteful number, since it uses less digits than its factorization.

12729439642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23486324.

The product of its digits is 1306368, while the sum is 49.

The spelling of 12729439642 in words is "twelve billion, seven hundred twenty-nine million, four hundred thirty-nine thousand, six hundred forty-two".