139009728 has 224 divisors, whose sum is σ = 444471552. Its totient is φ = 37785600.

The previous prime is 139009709. The next prime is 139009751. The reversal of 139009728 is 827900931.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1674775 + ... + 1674857.

It is an arithmetic number, because the mean of its divisors is an integer number (1984248).

Almost surely, 2^139009728 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 139009728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222235776).

139009728 is an abundant number, since it is smaller than the sum of its proper divisors (305461824).

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

139009728 is a wasteful number, since it uses less digits than its factorization.

139009728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 139009728 is about 11790.2386744289. The cubic root of 139009728 is about 518.0222308751.

The spelling of 139009728 in words is "one hundred thirty-nine million, nine thousand, seven hundred twenty-eight".