139129028 has 24 divisors (see below), whose sum is σ = 254788632. Its totient is φ = 66403584.

The previous prime is 139129019. The next prime is 139129057. The reversal of 139129028 is 820921931.

It can be written as a sum of positive squares in 4 ways, for example, as 91546624 + 47582404 = 9568^2 + 6898^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1025 + ... + 16712.

It is an arithmetic number, because the mean of its divisors is an integer number (10616193).

Almost surely, 2^139129028 is an apocalyptic number.

It is an amenable number.

139129028 is a deficient number, since it is larger than the sum of its proper divisors (115659604).

139129028 is a wasteful number, since it uses less digits than its factorization.

139129028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17831 (or 17829 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 139129028 is about 11795.2968593419. The cubic root of 139129028 is about 518.1703796947.

The spelling of 139129028 in words is "one hundred thirty-nine million, one hundred twenty-nine thousand, twenty-eight".