139865844 has 12 divisors (see below), whose sum is σ = 326353664. Its totient is φ = 46621944.

The previous prime is 139865837. The next prime is 139865849. The reversal of 139865844 is 448568931.

139865844 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 139865793 and 139865802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139865849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5827732 + ... + 5827755.

Almost surely, 2^139865844 is an apocalyptic number.

It is an amenable number.

139865844 is an abundant number, since it is smaller than the sum of its proper divisors (186487820).

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

139865844 is a wasteful number, since it uses less digits than its factorization.

139865844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11655494 (or 11655492 counting only the distinct ones).

The product of its digits is 829440, while the sum is 48.

The square root of 139865844 is about 11826.4890817182. The cubic root of 139865844 is about 519.0834990266.

The spelling of 139865844 in words is "one hundred thirty-nine million, eight hundred sixty-five thousand, eight hundred forty-four".