139139856 has 140 divisors (see below), whose sum is σ = 412017280. Its totient is φ = 45489600.

The previous prime is 139139851. The next prime is 139139863. The reversal of 139139856 is 658931931.

It is not an unprimeable number, because it can be changed into a prime (139139851) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 921381 + ... + 921531.

Almost surely, 2^139139856 is an apocalyptic number.

139139856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139139856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206008640).

139139856 is an abundant number, since it is smaller than the sum of its proper divisors (272877424).

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

139139856 is an equidigital number, since it uses as much as digits as its factorization.

139139856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256 (or 235 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 139139856 is about 11795.7558469138. The cubic root of 139139856 is about 518.1838219011.

The spelling of 139139856 in words is "one hundred thirty-nine million, one hundred thirty-nine thousand, eight hundred fifty-six".