139428 has 24 divisors (see below), whose sum is σ = 361760. Its totient is φ = 46440.

The previous prime is 139423. The next prime is 139429. The reversal of 139428 is 824931.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139428.

It is not an unprimeable number, because it can be changed into a prime (139423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 538 + ... + 753.

2¹³⁹⁴²⁸ is an apocalyptic number.

139428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

139428 is an abundant number, since it is smaller than the sum of its proper divisors (222332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139428 is a wasteful number, since it uses less digits than its factorization.

139428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1304 (or 1296 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 139428 is about 373.4005891800. The cubic root of 139428 is about 51.8541276653.

The spelling of 139428 in words is "one hundred thirty-nine thousand, four hundred twenty-eight".