139928 has 8 divisors (see below), whose sum is σ = 262380. Its totient is φ = 69960.

The previous prime is 139921. The next prime is 139939. The reversal of 139928 is 829931.

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 = 139894 and 139903.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139928.

It is not an unprimeable number, because it can be changed into a prime (139921) by changing a digit.

139928 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8738 + ... + 8753.

2¹³⁹⁹²⁸ is an apocalyptic number.

It is an amenable number.

139928 is a deficient number, since it is larger than the sum of its proper divisors (122452).

139928 is a wasteful number, since it uses less digits than its factorization.

139928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17497 (or 17493 counting only the distinct ones).

The product of its digits is 3888, while the sum is 32.

The square root of 139928 is about 374.0695122567. The cubic root of 139928 is about 51.9160380737.

The spelling of 139928 in words is "one hundred thirty-nine thousand, nine hundred twenty-eight".