139187805 has 16 divisors (see below), whose sum is σ = 226903680. Its totient is φ = 72832448.

The previous prime is 139187801. The next prime is 139187813. The reversal of 139187805 is 508781931.

It is a cyclic number.

It is not a de Polignac number, because 139187805 - 2² = 139187801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139187801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86745 + ... + 88334.

It is an arithmetic number, because the mean of its divisors is an integer number (14181480).

Almost surely, 2^139187805 is an apocalyptic number.

139187805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139187805 is a deficient number, since it is larger than the sum of its proper divisors (87715875).

139187805 is a wasteful number, since it uses less digits than its factorization.

139187805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175140.

The product of its (nonzero) digits is 60480, while the sum is 42.

The square root of 139187805 is about 11797.7881401558. The cubic root of 139187805 is about 518.2433388582.

The spelling of 139187805 in words is "one hundred thirty-nine million, one hundred eighty-seven thousand, eight hundred five".