139261808 has 40 divisors (see below), whose sum is σ = 312607968. Its totient is φ = 58862592.

The previous prime is 139261783. The next prime is 139261817. The reversal of 139261808 is 808162931.

139261808 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 an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 341 + ... + 16692.

Almost surely, 2^139261808 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 139261808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156303984).

139261808 is an abundant number, since it is smaller than the sum of its proper divisors (173346160).

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

139261808 is a wasteful number, since it uses less digits than its factorization.

139261808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17121 (or 17115 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 139261808 is about 11800.9240316172. The cubic root of 139261808 is about 518.3351686631.

The spelling of 139261808 in words is "one hundred thirty-nine million, two hundred sixty-one thousand, eight hundred eight".