139045729 has 2 divisors, whose sum is σ = 139045730. Its totient is φ = 139045728.

The previous prime is 139045727. The next prime is 139045747. The reversal of 139045729 is 927540931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138015504 + 1030225 = 11748^2 + 1015^2 .

It is an emirp because it is prime and its reverse (927540931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139045729 - 2¹ = 139045727 is a prime.

Together with 139045727, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 139045691 and 139045700.

It is not a weakly prime, because it can be changed into another prime (139045721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69522864 + 69522865.

It is an arithmetic number, because the mean of its divisors is an integer number (69522865).

Almost surely, 2^139045729 is an apocalyptic number.

It is an amenable number.

139045729 is a deficient number, since it is larger than the sum of its proper divisors (1).

139045729 is an equidigital number, since it uses as much as digits as its factorization.

139045729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 139045729 is about 11791.7653046522. The cubic root of 139045729 is about 518.0669464714.

The spelling of 139045729 in words is "one hundred thirty-nine million, forty-five thousand, seven hundred twenty-nine".