139385428 has 48 divisors (see below), whose sum is σ = 313286400. Its totient is φ = 52740864.

The previous prime is 139385423. The next prime is 139385429. The reversal of 139385428 is 824583931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139385423) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 48 + ... + 16696.

It is an arithmetic number, because the mean of its divisors is an integer number (6526800).

Almost surely, 2^139385428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139385428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156643200).

139385428 is an abundant number, since it is smaller than the sum of its proper divisors (173900972).

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

139385428 is a wasteful number, since it uses less digits than its factorization.

139385428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16696 (or 16694 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The square root of 139385428 is about 11806.1605952147. The cubic root of 139385428 is about 518.4884953216.

The spelling of 139385428 in words is "one hundred thirty-nine million, three hundred eighty-five thousand, four hundred twenty-eight".