139996729 has 4 divisors (see below), whose sum is σ = 140495220. Its totient is φ = 139498240.

The previous prime is 139996721. The next prime is 139996739. The reversal of 139996729 is 927699931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 927699931 = 43 ⋅21574417.

It can be written as a sum of positive squares in 2 ways, for example, as 69889600 + 70107129 = 8360^2 + 8373^2 .

It is a cyclic number.

It is not a de Polignac number, because 139996729 - 2³ = 139996721 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139996729.

It is not an unprimeable number, because it can be changed into a prime (139996721) 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, 248824 + ... + 249385.

It is an arithmetic number, because the mean of its divisors is an integer number (35123805).

Almost surely, 2^139996729 is an apocalyptic number.

It is an amenable number.

139996729 is a deficient number, since it is larger than the sum of its proper divisors (498491).

139996729 is an equidigital number, since it uses as much as digits as its factorization.

139996729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498490.

The product of its digits is 1653372, while the sum is 55.

The square root of 139996729 is about 11832.0213404135. The cubic root of 139996729 is about 519.2453661898.

The spelling of 139996729 in words is "one hundred thirty-nine million, nine hundred ninety-six thousand, seven hundred twenty-nine".