139106805 has 16 divisors (see below), whose sum is σ = 222735744. Its totient is φ = 74135360.

The previous prime is 139106777. The next prime is 139106813. The reversal of 139106805 is 508601931.

139106805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 139106805 - 2¹³ = 139098613 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25195 + ... + 30215.

It is an arithmetic number, because the mean of its divisors is an integer number (13920984).

Almost surely, 2^139106805 is an apocalyptic number.

139106805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139106805 is a deficient number, since it is larger than the sum of its proper divisors (83628939).

139106805 is a wasteful number, since it uses less digits than its factorization.

139106805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6876.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 139106805 is about 11794.3547937138. The cubic root of 139106805 is about 518.1427892063.

The spelling of 139106805 in words is "one hundred thirty-nine million, one hundred six thousand, eight hundred five".