139809086 has 4 divisors (see below), whose sum is σ = 209713632. Its totient is φ = 69904542.

The previous prime is 139809079. The next prime is 139809091. The reversal of 139809086 is 680908931.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 34952270 + ... + 34952273.

It is an arithmetic number, because the mean of its divisors is an integer number (52428408).

Almost surely, 2^139809086 is an apocalyptic number.

139809086 is a deficient number, since it is larger than the sum of its proper divisors (69904546).

139809086 is an equidigital number, since it uses as much as digits as its factorization.

139809086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69904545.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 139809086 is about 11824.0892249678. The cubic root of 139809086 is about 519.0132742870.

The spelling of 139809086 in words is "one hundred thirty-nine million, eight hundred nine thousand, eighty-six".