139778808 has 128 divisors (see below), whose sum is σ = 391910400. Its totient is φ = 41273856.

The previous prime is 139778803. The next prime is 139778809. The reversal of 139778808 is 808877931.

139778808 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139778803) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1306291 + ... + 1306397.

It is an arithmetic number, because the mean of its divisors is an integer number (3061800).

Almost surely, 2^139778808 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 139778808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195955200).

139778808 is an abundant number, since it is smaller than the sum of its proper divisors (252131592).

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

139778808 is a wasteful number, since it uses less digits than its factorization.

139778808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261 (or 257 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 51.

The square root of 139778808 is about 11822.8088033259. The cubic root of 139778808 is about 518.9758045752.

The spelling of 139778808 in words is "one hundred thirty-nine million, seven hundred seventy-eight thousand, eight hundred eight".