139073805 has 24 divisors (see below), whose sum is σ = 259605528. Its totient is φ = 68466816.

The previous prime is 139073791. The next prime is 139073813. The reversal of 139073805 is 508370931.

It can be written as a sum of positive squares in 4 ways, for example, as 3164841 + 135908964 = 1779^2 + 11658^2 .

It is not a de Polignac number, because 139073805 - 2⁴ = 139073789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139073805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 118282 + ... + 119451.

It is an arithmetic number, because the mean of its divisors is an integer number (10816897).

Almost surely, 2^139073805 is an apocalyptic number.

139073805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139073805 is a deficient number, since it is larger than the sum of its proper divisors (120531723).

139073805 is a wasteful number, since it uses less digits than its factorization.

139073805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237757 (or 237754 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 139073805 is about 11792.9557363708. The cubic root of 139073805 is about 518.1018133429.

The spelling of 139073805 in words is "one hundred thirty-nine million, seventy-three thousand, eight hundred five".