139522729 has 4 divisors (see below), whose sum is σ = 140587920. Its totient is φ = 138457540.

The previous prime is 139522717. The next prime is 139522781. The reversal of 139522729 is 927225931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 139522729 - 2⁵ = 139522697 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139522691 and 139522700.

It is not an unprimeable number, because it can be changed into a prime (139522429) 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, 532399 + ... + 532660.

It is an arithmetic number, because the mean of its divisors is an integer number (35146980).

Almost surely, 2^139522729 is an apocalyptic number.

It is an amenable number.

139522729 is a deficient number, since it is larger than the sum of its proper divisors (1065191).

139522729 is a wasteful number, since it uses less digits than its factorization.

139522729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065190.

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

The square root of 139522729 is about 11811.9739671234. The cubic root of 139522729 is about 518.6586843863.

The spelling of 139522729 in words is "one hundred thirty-nine million, five hundred twenty-two thousand, seven hundred twenty-nine".