139845805 has 16 divisors (see below), whose sum is σ = 188978688. Its totient is φ = 98424000.

The previous prime is 139845803. The next prime is 139845841. The reversal of 139845805 is 508548931.

It is not a de Polignac number, because 139845805 - 2¹ = 139845803 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139845803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39306 + ... + 42715.

It is an arithmetic number, because the mean of its divisors is an integer number (11811168).

Almost surely, 2^139845805 is an apocalyptic number.

It is an amenable number.

139845805 is a deficient number, since it is larger than the sum of its proper divisors (49132883).

139845805 is a wasteful number, since it uses less digits than its factorization.

139845805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82068.

The product of its (nonzero) digits is 172800, while the sum is 43.

The square root of 139845805 is about 11825.6418430460. The cubic root of 139845805 is about 519.0587076247.

The spelling of 139845805 in words is "one hundred thirty-nine million, eight hundred forty-five thousand, eight hundred five".