139040256 has 80 divisors (see below), whose sum is σ = 373779648. Its totient is φ = 45926400.

The previous prime is 139040249. The next prime is 139040257. The reversal of 139040256 is 652040931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139040257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200871 + ... + 201561.

Almost surely, 2^139040256 is an apocalyptic number.

139040256 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 139040256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186889824).

139040256 is an abundant number, since it is smaller than the sum of its proper divisors (234739392).

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

139040256 is an equidigital number, since it uses as much as digits as its factorization.

139040256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843 (or 827 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 139040256 is about 11791.5332336384. The cubic root of 139040256 is about 518.0601491450.

The spelling of 139040256 in words is "one hundred thirty-nine million, forty thousand, two hundred fifty-six".