139155928 has 8 divisors (see below), whose sum is σ = 260917380. Its totient is φ = 69577960.

The previous prime is 139155883. The next prime is 139155941. The reversal of 139155928 is 829551931.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8697238 + ... + 8697253.

Almost surely, 2^139155928 is an apocalyptic number.

It is an amenable number.

139155928 is a deficient number, since it is larger than the sum of its proper divisors (121761452).

139155928 is a wasteful number, since it uses less digits than its factorization.

139155928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17394497 (or 17394493 counting only the distinct ones).

The product of its digits is 97200, while the sum is 43.

The square root of 139155928 is about 11796.4370892232. The cubic root of 139155928 is about 518.2037728818.

The spelling of 139155928 in words is "one hundred thirty-nine million, one hundred fifty-five thousand, nine hundred twenty-eight".