139235128 has 8 divisors (see below), whose sum is σ = 261065880. Its totient is φ = 69617560.

The previous prime is 139235111. The next prime is 139235143. The reversal of 139235128 is 821532931.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 139235093 and 139235102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8702188 + ... + 8702203.

It is an arithmetic number, because the mean of its divisors is an integer number (32633235).

Almost surely, 2^139235128 is an apocalyptic number.

It is an amenable number.

139235128 is a deficient number, since it is larger than the sum of its proper divisors (121830752).

139235128 is a wasteful number, since it uses less digits than its factorization.

139235128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17404397 (or 17404393 counting only the distinct ones).

The product of its digits is 12960, while the sum is 34.

The square root of 139235128 is about 11799.7935575162. The cubic root of 139235128 is about 518.3020653887.

The spelling of 139235128 in words is "one hundred thirty-nine million, two hundred thirty-five thousand, one hundred twenty-eight".